Mishneh Torah, Murderer and the Preservation of Life 1

Shabbat shalom, my dear friends, and welcome to a journey into the radiant heart of Sephardi and Mizrahi wisdom! Today, we unfurl a scroll vibrant with the hues of ancient lands and the echoes of profound legal thought, guided by the luminous hand of the Rambam.

Hook

Imagine the bustling souk in Fez, the scent of spices and oud mingling with the murmur of Hebrew scholarship emanating from a quiet courtyard, where a hakham meticulously inscribes a legal responsum, forever shaping the communal understanding of justice and the sanctity of life.

Context

The Golden Thread of Sefarad and Mizrahi Lands

Our path today weaves through the rich tapestry of Sephardi and Mizrahi heritage, a legacy stretching across millennia and continents, from the sun-drenched Iberian Peninsula to the ancient lands of Babylon, Egypt, and Yemen. This is not a monolithic tradition but a mosaic of vibrant communities, each contributing its unique color and texture to the grand design of Jewish life. To understand the profound depth of the text before us, we must first immerse ourselves in the historical and intellectual milieu that birthed it.

The Iberian Crucible: Sefarad's Intellectual Zenith

Let us begin in Sefarad, the Hebrew name for Spain, which, during the medieval period, became an unrivaled beacon of Jewish intellectual and cultural flourishing. This era, often dubbed the "Golden Age" (roughly 9th to 13th centuries), saw Jewish scholars, poets, philosophers, and scientists thrive under both Muslim and, for a time, Christian rule. Cities like Cordoba, Granada, Toledo, and Lucena were vibrant centers of learning, where Jews engaged deeply with Islamic philosophy, Greek science, and their own rich tradition, often writing in Judeo-Arabic, a testament to their deep integration and cultural synthesis.

In this fertile ground, a distinct intellectual ethos emerged: one that championed rational inquiry, systematic thought, and the harmonious integration of faith and reason. The talmid hakham (scholar) was not just a master of Torah but often also a physician, a statesman, a philosopher, or a poet. This holistic approach to knowledge profoundly shaped the Sephardi mind, emphasizing clarity, precision, and the pursuit of truth through rigorous analysis. It was in this environment that the seeds of comprehensive legal codification were sown, driven by a desire to make the vast ocean of Talmudic law accessible and applicable.

Maimonides: A Sephardi Giant, A Universal Legacy

No figure embodies this spirit more perfectly than Rabbi Moshe ben Maimon, the Rambam (Maimonides), whose work, the Mishneh Torah, we explore today. Born in Cordoba in 1138, Maimonides' life story is a microcosm of the Sephardi experience itself – marked by both flourishing and upheaval. His family was forced to flee during the Almohad persecution, embarking on a remarkable odyssey that took them across North Africa, through Fez, and eventually to Fustat (Old Cairo), Egypt, where he would become the court physician to Saladin and the spiritual leader of Egyptian Jewry.

This journey was not merely geographical; it was an intellectual crucible. In Fez, Maimonides continued his studies, writing his commentary on the Mishnah. In Egypt, he composed his monumental works: the Mishneh Torah and the Guide for the Perplexed. His experiences across diverse Jewish communities, under different political and cultural landscapes, imbued him with a unique perspective and a profound understanding of the practical needs of the Jewish people. He witnessed firsthand the challenges of maintaining halakhic integrity amidst changing times and varying customs.

The Mishneh Torah, completed around 1177 CE, was a revolutionary undertaking. Before Maimonides, Jewish law was primarily found in the Talmud, a vast, often discursive, and uncodified sea of discussion. Maimonides set out to create a comprehensive, organized, and logically structured code of all Jewish law, drawing from the Talmud, Geonic literature, and earlier Rishonim, presenting it in clear, elegant Hebrew. His goal was to distill the essence of halakha, making it accessible to every Jew, from the greatest scholar to the simplest layperson, without the need to wade through the complexities of the Talmud. It was intended to be a "second Torah" (hence Mishneh Torah), a complete guide to Jewish practice and belief.

The Embrace of Mizrahi Communities

While Maimonides was Sephardi by birth and intellectual formation, his influence transcended geographical boundaries, particularly resonating deeply within Mizrahi communities. The term "Mizrahi" encompasses Jewish communities from the Middle East, North Africa, and Central Asia – places like Iraq (Babylon), Syria, Yemen, Persia (Iran), Afghanistan, and North Africa (Morocco, Algeria, Tunisia, Libya, Egypt). These communities, many of which predated the Golden Age of Sefarad by centuries, had their own distinct traditions, linguistic nuances (e.g., Judeo-Arabic, Judeo-Persian), and legal scholars.

Yet, the Mishneh Torah found immediate and widespread acceptance among them. Why?

1. Clarity and Authority: Maimonides' unparalleled clarity, logical structure, and decisiveness in presenting halakha were highly valued. For communities that often faced complex legal questions without always having direct access to extensive libraries or the full range of Talmudic discourse, the Mishneh Torah provided a definitive and authoritative guide.
2. Shared Intellectual Currents: Many Mizrahi communities, particularly those under Islamic rule, also engaged with Arabic philosophy and science, fostering an intellectual environment that appreciated Maimonides' rationalist approach. Scholars in Baghdad, Aleppo, and Cairo were deeply conversant with similar intellectual trends.
3. Halakhic Consistency: The Mishneh Torah offered a unified framework for Jewish law, helping to standardize practice and resolve discrepancies across disparate communities. This was particularly crucial for communities that were geographically separated but sought to maintain a common halakhic thread.
4. Maimonides' Personal Connection: Maimonides himself spent a significant portion of his life in Egypt, a major Mizrahi center, and his influence was felt directly through his leadership and responsa. Yemeni Jewry, in particular, held him in immense reverence, seeing him as their ultimate halakhic authority, especially after he penned his famous Iggeret Teiman (Epistle to Yemen) to bolster their faith during a time of persecution.

Thus, the Mishneh Torah became a foundational text studied, quoted, and revered across the entire Sephardi and Mizrahi world. It wasn't just a legal code; it was a testament to the enduring power of Jewish intellect and an anchor for Jewish life, uniting diverse communities through a shared commitment to halakha. The intricate laws concerning the sanctity of life, the prevention of murder, and the rodef principle, which we delve into today, are not mere academic exercises but vital components of a just and moral society, meticulously articulated by a master whose vision transcended his time and place. This text is a celebration of divine law, human responsibility, and the profound value placed on every single soul within the Sephardi and Mizrahi tradition.

Text Snapshot

From the profound clarity of the Rambam's Mishneh Torah, we draw a powerful instruction regarding the sanctity of life and the imperative to act:

Whenever a person kills a human being, he transgresses a negative commandment, as Exodus 20:13 states: "Do not murder." If a person kills a Jew intentionally in the presence of witnesses, he should be executed by decapitation.
...
When, however, a person is pursuing a colleague with the intention of killing him - even if the pursuer is a minor - every Jewish person is commanded to attempt to save the person being pursued, even if it is necessary to kill the pursuer.
...
Whenever a person can save another person's life, but he fails to do so, he transgresses a negative commandment, as Leviticus 19:16 states: "Do not stand idly by while your brother's blood is at stake."

Sefaria Source: Mishneh Torah, Murderer and the Preservation of Life 1

Minhag/Melody

The Sanctity of Life and the Communal Pulpit: The Shabbat Hagadol Drasha

The text before us, from Maimonides' Mishneh Torah, delves into some of the most profound and challenging aspects of Jewish law: the severe prohibition against murder, the detailed regulations of capital punishment (though rarely, if ever, practically applied in post-Temple times), and critically, the rodef principle and the overarching commandment "Do not stand idly by while your brother's blood is at stake." These are not abstract legal concepts; they are the very bedrock of a just and moral society, demanding active participation and vigilance from every individual and the community as a whole.

In Sephardi and Mizrahi communities, the dissemination and internalization of such vital halakhic principles were not left to individual study alone. While personal learning was always paramount, the communal setting played a crucial role in shaping the ethical consciousness of the kahal. One particularly powerful and enduring minhag (custom) that profoundly connects to the spirit of our text is the Shabbat Hagadol Drasha – the "Great Sermon" delivered on Shabbat Hagadol, the Sabbath immediately preceding Passover.

The Significance of Shabbat Hagadol

Shabbat Hagadol is traditionally named after the "Great Miracle" (נס גדול) that occurred on the 10th of Nisan, four days before the Exodus from Egypt, when the Israelites were commanded to set aside a lamb for the Passover sacrifice. This act, in defiance of their Egyptian masters who worshipped lambs, was a profound demonstration of faith and a pivotal moment in their journey to freedom. The Sabbath preceding Passover became a time for introspection, preparation for the festival of liberation, and, crucially, for communal instruction in the intricate laws of Passover.

However, the Shabbat Hagadol Drasha evolved to encompass far more than just Passover halakhot. It became a central platform for the Hakham (rabbinic sage) or Mara D'Atra (local halakhic authority) to address the community on a wide range of ethical, moral, and complex halakhic issues relevant to their lives. This was a moment of deep communal engagement, where the entire congregation, men and women, young and old, gathered to listen to their spiritual leader.

The Drasha: A Deep Dive into Halakha and Ethics

The Shabbat Hagadol Drasha in Sephardi and Mizrahi communities was, and remains, a masterclass in rabbinic pedagogy. Unlike a typical sermon, it often stretched for an hour or more, sometimes even longer, and was characterized by its depth, its structured delivery, and its blend of halakha (law), aggadah (narrative/ethics), and mussar (moral instruction).

1. Halakhic Precision: The Hakham would meticulously expound upon complex halakhic topics, often drawing directly from the Mishneh Torah, the Shulchan Aruch, and their commentaries. The goal was not merely to inform but to educate the community on the nuances of Jewish law, demonstrating the rigorous analytical process that underlies every ruling. For a text like Maimonides' Murderer and the Preservation of Life, the Hakham might dedicate a significant portion of his drasha to dissecting its principles.

   • Unpacking "Do Not Murder": He would begin with the fundamental prohibition, explaining the various categories of killing in Jewish law (intentional murder, accidental killing, justifiable killing). He would emphasize the gravity of the sin, echoing Maimonides' statement: "There is nothing that the Torah warned so strongly against as murder, as Ibid.:33 states: 'Do not pollute the land in which you live, for blood will pollute the land.'"
   • The Rodef Principle: This would be a crucial segment. The Hakham would explain the concept of the rodef – the "pursuer" who intends to kill or commit a grave transgression like rape. He would detail the commandment to intervene, "even if it is necessary to kill the pursuer." This is a stark and difficult concept, requiring careful elucidation. The Hakham would stress that this is not an act of vengeance but a proactive measure to save an innocent life, a mitzvah. He would explain the hierarchy of intervention: first, try to incapacitate the rodef (maiming a limb), and only if that is impossible, take their life. He might cite the example Maimonides uses: "If there is no way to be precise in one's aim and save the person being pursued without killing the rodef, one should kill him, even though he has not yet killed his victim."
   • "Do Not Stand Idly By": Perhaps the most universally applicable teaching from this chapter, the Hakham would dedicate considerable time to the commandment "Do not stand idly by while your brother's blood is at stake." He would expand on Maimonides' interpretation, which broadens this beyond physical danger to include situations like warning a colleague of financial harm, appeasing an aggressor, or informing someone of a plot against them. This transforms a seemingly specific commandment into a profound ethical imperative for active communal responsibility. The Hakham would impress upon the community that this mitzvah is not just about dramatic acts of heroism but about everyday vigilance and compassion.

2. Aggadic Enrichment and Mussar: While rooted in halakha, the Drasha was not dry. It was richly interwoven with aggadah – parables, stories, and ethical teachings from the Talmud, Midrash, and later rabbinic literature. These narratives brought the halakhic principles to life, making them relatable and emotionally resonant. The Hakham would often use these stories to illustrate the consequences of inaction, the rewards of courage, and the profound value of human life.

   • Illustrating the Value of Life: He might tell stories that emphasize the cosmic significance of each soul, such as the famous Mishnah in Sanhedrin 4:5 (often quoted by Maimonides) that "whoever destroys a single soul is considered as if he destroyed an entire world, and whoever saves a single soul is considered as if he saved an entire world." This teaching, directly referenced by Maimonides at the end of our chapter, would serve as a powerful moral anchor for the discussion of saving life.
   • Cultivating Yirat Shamayim: The Hakham would aim to instill yirat Shamayim (fear of Heaven) – a profound reverence for God and His commandments – which serves as the ultimate motivation for adhering to such stringent laws. He would emphasize that our lives, and the lives of others, are not our own, but belong to the Holy One, blessed be He, as Maimonides states: "the soul of the victim is not the property of the blood redeemer, but the property of the Holy One, blessed be He."

3. Rhetorical Style and Melodic Delivery: The delivery of a Sephardi Drasha was often a performance in itself. Hakhamim were known for their oratorical skills, their ability to captivate an audience with passion, wisdom, and sometimes, even a touch of humor. The drasha might be delivered in a blend of Hebrew and the local vernacular (Judeo-Arabic, Judeo-Spanish, Judeo-Persian), ensuring that the message reached every segment of the community.

   • Melodic Inflection: While not a piyut in the traditional sense, the drasha often incorporated melodic inflections, chanting of scriptural verses, and rhythmic cadences drawn from the rich musical traditions of Sephardi and Mizrahi liturgical practice. This melodic quality, often subtle but pervasive, would enhance the emotional impact of the sermon, making the complex legal arguments more accessible and memorable, resonating deep within the souls of the listeners. The Hakham might chant scriptural passages using the traditional Sephardi Ta'amei Hamikra (cantillation notes), adding a layer of authenticity and reverence to the presentation of divine law.

Enduring Legacy

The Shabbat Hagadol Drasha served as a vital communal pedagogical tool, ensuring that the profound ethical and legal principles enshrined in texts like the Mishneh Torah were not merely theoretical constructs but living, breathing directives for daily life. It fostered a deep sense of communal responsibility, impressing upon each individual their role as a guardian of life and justice. Through the eloquent and passionate words of their Hakhamim, Sephardi and Mizrahi communities continually reaffirmed their commitment to the sanctity of life, the active prevention of harm, and the unwavering pursuit of a just society, guided by the timeless wisdom of Torah. This minhag is a testament to the textured, proud, and historically aware approach to Torah learning that is a hallmark of our heritage.

Contrast

The Fetus as Rodef: A Halakhic Divergence

Our chosen text from Maimonides, Mishneh Torah, Murderer and the Preservation of Life 1, presents a stark and ethically challenging application of the rodef principle:

On this basis, our Sages ruled that when complications arise and a pregnant woman cannot give birth, it is permitted to abort the fetus in her womb, whether with a knife or with drugs. For the fetus is considered a rodef of its mother. If the head of the fetus emerges, it should not be touched, because one life should not be sacrificed for another. Although the mother may die, this is the nature of the world.

Sefaria Source: Mishneh Torah, Murderer and the Preservation of Life 1:9

This Maimonidean ruling, deeply rooted in the Talmud (Mishnah Ohalot 7:6), represents a clear and forceful stance within Jewish law regarding the tragic conflict between the life of a pregnant woman and that of her fetus. While the ultimate goal – saving the mother's life – is universally accepted, the precise halakhic categorization of the fetus in such a situation, and the point at which intervention becomes forbidden, reveals a fascinating and respectful divergence in emphasis among different Jewish legal traditions.

Maimonides' Sephardi Approach: The Fetus as a Rodef

For Maimonides and many Sephardi authorities who follow his clear articulation, the halakhic framework is unequivocally the rodef principle. A rodef is a "pursuer" who is actively endangering another's life. The Torah commands us to intervene and prevent the rodef from achieving their deadly aim, even if it means taking the rodef's life.

Maimonides' logic is precise:

1. Nature of the Threat: When a fetus endangers its mother's life (e.g., in cases of ectopic pregnancy, severe pre-eclampsia, or other life-threatening complications), it is seen as an active threat, analogous to any other aggressor. The fetus, by its very existence in a way that imperils the mother, is "pursuing" her life.
2. Pre-Natal Status: Crucially, Maimonides, following the Mishnah, asserts that prior to the emergence of its head, a fetus is not considered a nefesh (a fully formed person with independent life status) in the same way as a born individual. Its life is secondary to that of the mother. It is part of its mother, or at least not yet a fully independent being whose life is equal to that of the mother.
3. Proactive Intervention: Because it is not yet a nefesh and is acting as a rodef, the command to save the mother's life by any means necessary applies. This allows for the termination of the pregnancy.
4. The Cut-off Point: The moment the head emerges, the halakha shifts dramatically. At this point, the fetus is considered to have acquired the status of a nefesh – an independent life. Now, two lives are in conflict, and Jewish law states: "one life should not be sacrificed for another." Even if both are likely to die, or the mother is still in grave danger, direct intervention against the fetus is no longer permitted. The tragic outcome is considered "the nature of the world."

This Maimonidean position, widely adopted in Sephardi and Mizrahi communities, prioritizes the mother's life unequivocally before the fetus achieves full nefesh status, applying a clear and consistent legal framework. The clarity of the rodef categorization provides a strong halakhic basis for action in these dire circumstances.

A Respectful Ashkenazi Nuance: Pikuach Nefesh vs. Rodef

While Ashkenazi authorities agree that the mother's life takes precedence, some prominent figures, such as Rabbi Moshe Isserles (the Rema, 16th century, Poland), in his glosses to the Shulchan Aruch (Orach Chaim 330:10), introduce a nuanced distinction. The Rema, drawing from earlier Ashkenazi Rishonim, also permits intervention to save the mother, but sometimes prefers to frame it less as the fetus being a rodef in the full sense (an intentional aggressor) and more as a case of pikuach nefesh (saving a life) where the mother's life simply takes precedence because she is already a full nefesh.

The subtle differences in reasoning often revolve around these points:

1. Definition of Rodef: Some Ashkenazi authorities are hesitant to label a fetus, which acts without malicious intent, as a rodef in the same way one would label a conscious aggressor. While the outcome is the same (danger to life), the intent is absent in the fetus. This doesn't negate the need to save the mother, but it shifts the conceptual framework.
2. Weight of Potential Life: While a fetus is not a nefesh according to the Mishnah, some Ashkenazi views might place a slightly greater emphasis on the potential life of the fetus, even before the head emerges. This doesn't change the permissibility of saving the mother, but it might influence the hesitation or gravitas with which such a decision is made. The act is still permissible, but the terminology chosen reflects a different emphasis.
3. "Chayeha Kodmin" (Her Life Comes First): Many Ashkenazi poskim will explain the permissibility of abortion in these circumstances by simply stating "her life comes first," rather than invoking the rodef principle directly. This emphasizes the value of the mother's established life over the developing fetus, without necessarily attributing "aggressor" status to the fetus.
4. The Moment of Independence: Both traditions agree on the critical threshold of the head emerging. Once the fetus's head emerges, it is considered a full nefesh, and one may not take its life to save the mother. This shared boundary underscores the fundamental agreement on the sanctity of life once it achieves independent status.

Underlying Philosophical and Theological Nuances

These distinctions, while subtle, reveal deeper philosophical approaches:

• Maimonides (Sephardi): His legal reasoning often seeks to apply principles with utmost consistency and clarity. If something objectively causes a threat to life, it falls under the relevant legal category, even if intent is absent (as in the case of a minor rodef). The rodef principle offers a clean, decisive halakhic mechanism for intervention.
• Ashkenazi (some views): Some Ashkenazi authorities might prioritize avoiding the categorization of an innocent, developing life as an "aggressor." While the outcome is the same, the framing acknowledges the tragic nature of the choice by emphasizing the mother's established life over the fetus's developing life, without necessarily using the more aggressive rodef terminology. This approach may reflect a greater emphasis on the sanctity of potential life, even while affirming the mother's absolute priority.

It is crucial to emphasize that both Sephardi and Ashkenazi traditions arrive at the same practical conclusion: in cases of life-threatening danger to the mother, intervention to save her life is not only permissible but mandated, up until the point the fetus's head emerges. The difference lies in the precise halakhic mechanism and the underlying conceptual framework used to arrive at this conclusion. Both approaches are deeply rooted in Torah, driven by profound compassion, and reflect a meticulous engagement with the complexities of Jewish law, each offering a distinct yet equally valid path to navigating such tragic dilemmas. This contrast highlights the rich diversity and intellectual depth within Jewish legal thought, where different interpretive lenses enrich our understanding of divine wisdom.

Home Practice

Cultivating Active Care: The "Do Not Stand Idly By" Daily Reflection

The profound teachings of Maimonides in Murderer and the Preservation of Life 1 do not merely address the gravest of sins; they establish a fundamental ethical imperative for every Jew: "Do not stand idly by while your brother's blood is at stake" (Sefaria Source: Leviticus 19:16). This commandment extends far beyond preventing murder; it is a call to active care, to vigilance, and to intervention whenever a fellow human being is in danger – be it physical, emotional, or even financial. This ethos of proactive responsibility is a cornerstone of Sephardi and Mizrahi mussar (ethical instruction) traditions, which emphasize the constant cultivation of character and moral sensitivity.

To bring this powerful teaching into our daily lives, let us adopt a small yet impactful home practice: the "Do Not Stand Idly By" Daily Reflection.

The Practice: A Moment of Mindful Engagement

1. Morning Intention (5 minutes): Begin your day with a brief moment of intention. As you prepare for your day, quietly reflect on the commandment: "Do not stand idly by." Ask yourself: "How can I be a guardian of others' well-being today? What opportunities might arise for me to prevent harm or offer help, even in small ways?" This sets a conscious frame for your interactions.

   • Sephardi/Mizrahi Connection: This aligns with the mussar practice of setting daily ethical goals, known as kabbalot, where one resolves to improve a specific character trait or fulfill a particular mitzvah with greater diligence.

2. Midday Awareness (Ongoing): Throughout your day, maintain a heightened awareness of your surroundings and the people in them. This isn't about being paranoid, but about being present and observant.

   • Did you see a colleague struggling with a task, a stranger looking lost, a friend expressing quiet distress, or a neighbor facing a minor challenge?
   • Did you hear a hurtful remark, witness an unfair situation, or become aware of information that could prevent someone from being harmed (as Maimonides includes informing a colleague of danger)?
   • The "blood" in "brother's blood" is broadly interpreted by Maimonides to include not just physical harm, but also emotional distress, financial loss, or reputational damage. Remember his examples: "when a person sees a colleague drowning at sea or being attacked by robbers or a wild animal... Similarly, it applies when he hears gentiles or mosrim conspiring to harm a colleague or planning a snare for him, and he does not inform him and notify him of the danger." (Sefaria Source: Mishneh Torah, Murderer and the Preservation of Life 1:16). This expands our understanding of "danger" significantly.

3. Evening Reflection (10 minutes): Before concluding your day, take a dedicated moment to reflect.

   • Review: Go back through your day. Were there instances where you saw someone in need, or a situation where you could have intervened, but you "stood idly by"? Be honest with yourself, without judgment.
   • Acknowledge: Acknowledge any missed opportunities. Perhaps you were too busy, too shy, or simply didn't notice. This is a learning process.
   • Resolve: For each missed opportunity, formulate a concrete resolution for how you will act differently next time. For example, "Next time I see a new employee looking overwhelmed, I will offer to help them find their way," or "If I hear a unkind comment, I will gently steer the conversation in a more positive direction."
   • Celebrate: Importantly, also celebrate any instances where you did act, even in a small way. Did you offer a kind word, hold a door, report a legitimate concern, or offer assistance? Recognize these moments as fulfillments of the mitzvah.

Why This Practice?

This daily reflection, inspired by the spirit of mussar, helps us internalize the profound responsibility articulated by Maimonides. It shifts us from passive observers to active participants in creating a more compassionate and just world. It teaches us that "saving a life" isn't always a dramatic act of heroism; it's often a series of small, conscious choices to prevent harm, offer support, and stand up for the well-being of others. By regularly engaging with this commandment, we cultivate a heightened sense of ethical awareness, compassion, and courage – qualities deeply cherished and continually fostered in Sephardi and Mizrahi communities. It is a way of living the Torah, not just learning it, ensuring that the blood of our brothers and sisters is never shed, physically or metaphorically, because we stood idly by.

Takeaway + Citations

The Sephardi and Mizrahi tradition, with its unwavering commitment to the systematic study of Torah and the cultivation of ethical living, presents us with a radiant path to justice and compassion. Through the luminous clarity of Maimonides' Mishneh Torah and the enduring communal practices like the Shabbat Hagadol Drasha, we learn that the sanctity of life is paramount, demanding not just passive reverence but active, courageous intervention. Our heritage calls upon us to be vigilant guardians of each other's well-being, to understand the intricate balance of divine law, and to never stand idly by.

Citations

• Mishneh Torah, Murderer and the Preservation of Life 1:1: https://www.sefaria.org/Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.1
• Mishneh Torah, Murderer and the Preservation of Life 1:9: https://www.sefaria.org/Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.9
• Mishneh Torah, Murderer and the Preservation of Life 1:16: https://www.sefaria.org/Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.16
• Mishneh Torah, Murderer and the Preservation of Life 1:18: https://www.sefaria.org/Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.18
• Leviticus 19:16: https://www.sefaria.org/Leviticus.19.16
• Mishnah Ohalot 7:6: https://www.sefaria.org/Mishnah_Ohalot.7.6
• Shulchan Aruch, Orach Chaim 330:10 (Rema's glosses): https://www.sefaria.org/Shulchan_Arukh%2C_Orach_Chayyim.330.10?lang=bi&with=Rema&lang2=en
• Steinsaltz on Mishneh Torah, Murderer and the Preservation of Life 1:1:1: https://www.sefaria.org/Steinsaltz_on_Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.1.1?lang=bi&with=all
• Steinsaltz on Mishneh Torah, Murderer and the Preservation of Life 1:10:2: https://www.sefaria.org/Steinsaltz_on_Mishneh_Torah%2C_Murderer_and_the_Preservation_of_Life.1.10.2?lang=bi&with=all