Mishneh Torah, Negative Mitzvot 1-122

Sugya Map

The Nexus of Rabbinic Authority and Divine Command

The concluding paragraphs of the Rambam's enumeration of Negative Mitzvot present a foundational sugya concerning the nature of Rabbinic enactments (mitzvot d'Rabbanan) and their intricate relationship with the Biblical prohibitions of Bal Tosif u'Val Tigra (adding to or subtracting from the Torah) and the positive command of Lo Tasur (not deviating from the rulings of the Sages).

• Issue: How can Chazal (the Sages) institute new mitzvot—such as Chanukah candles, Megillah reading, or Netilat Yadayim—without transgressing the Biblical prohibition of Bal Tosif (Deuteronomy 13:1), which forbids adding to God's commandments?
• Nafka Mina(s):
  • The philosophical and halachic source of authority for takkanot (ordinances) and gezeirot (decrees) promulgated by Chazal.
  • The precise definition and scope of Bal Tosif.
  • The severity of transgressing a mitzvah d'Rabbanan: is it merely a Rabbinic transgression, or does it carry a d'Oraita (Biblical) weight due to Lo Tasur (Deuteronomy 17:11)?
  • The distinction between a prophet's role and a Beit Din's (court's) authority in shaping Halacha.
• Primary Sources: Mishneh Torah, Negative Mitzvot 1-122 (concluding paragraphs); Sefer HaMitzvot, Shoresh Sheni; Devarim 4:2, 13:1, 17:11; Sanhedrin 11a-b; Hassagot HaRamban al Sefer HaMitzvot, Shoresh Rishon.

Text Snapshot

The Rambam concludes his enumeration of the 365 negative commandments with a pivotal discussion on the origin and authority of mitzvot d'Rabbanan:

"These 613 mitzvot were given to Moses on Mount Sinai together with their general principles, particular points, and details. These general principles, particular points, and details represent the Oral Law, which each court received from the previous court. There are [also] other commandments that were instituted after the giving of the Torah. They were established by the Prophets and Sages and spread throughout Israel, for example, the reading of the Megillah, [lighting] a Chanukah candle, fasting on Tish'ah b'Av, [setting up] eruvim, and [washing one's] hands [in preparation for prayer and eating]. Each of these commandments also possesses explanatory aspects and details. All of this will be explained in this text. We are obligated to accept and observe all these commandments which [the Rabbis] instituted, as [implied by Deuteronomy 17:11]: 'Do not deviate from the instructions that they will give you, left or right.' They are not considered to be additions to the commandments of the Torah. [If so,] what was the intention of the Torah's warning (Deuteronomy 13:11): 'Do not add to it and do not detract from it'? That a prophet is not permitted to introduce a new measure and say that the Holy One, blessed be He, commanded this mitzvah to us and that it should be added to the Torah's mitzvot, or [say that He commanded that we] eliminate one of the 613 mitzvot mentioned above. However, if a court, together with the prophet of that age, adds a commandment as an ordinance, a lesson, or as a decree, this is not considered as an addition. He is not saying that the Holy One, blessed be He, commanded us to make an eruv or read the Megillah at its [appointed] time. Were he to say so, he would be adding to the Torah. Instead, we are saying that the prophets and the courts ordained and commanded that the Megillah be read at its [appointed] time in order to recall the praise of the Holy One, blessed be He, the salvation He wrought for us, and His response to our cries, so that we will bless Him, extol Him, and inform the future generations of the truth of the Torah's promise (Deuteronomy 4:7): 'What nation is so great that it has God [close to it....]'. Similar principles apply with regard to all the other Rabbinic commandments, be they positive commandments or negative commandments." [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs]

Dikduk/Leshon Nuance

The Rambam's careful wording, particularly the distinction between "say that the Holy One, blessed be He, commanded this mitzvah to us" and "the prophets and the courts ordained and commanded that the Megillah be read," is critical. He uses "צוה לנו הקב"ה" (commanded us the Holy One, Blessed be He) versus "תקנו וצוהו הנביאים ובית דין" (the prophets and the court ordained and commanded). This linguistic precision underscores his central chiddush that the source of the command, not merely its existence, determines if Bal Tosif is violated. The repeated phrase "לאו דאורייתא" (not Biblical) or "לאו דרבנן" (Rabbinic prohibition) throughout the enumeration also highlights the significance of this categorization.

Readings

Rambam's Chiddush: Lo Tasur as the Enabler of Rabbinic Legislation

The Rambam's approach, as elucidated in this passage and more extensively in Sefer HaMitzvot, Shoresh Sheni, posits that the Torah itself provides the mechanism for Chazal's authority to legislate. The command "לֹא תָסוּר מִן הַדָּבָר אֲשֶׁר יַגִּידוּ לְךָ יָמִין וּשְׂמֹאל" (Deuteronomy 17:11) [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs] is a d'Oraita positive commandment to obey the Beit Din HaGadol (the Great Court) in all generations. This obedience extends to their takkanot and gezeirot.

The Rambam differentiates between two types of "additions":

1. A prophet claiming a new mitzvah is mi'Sinai: This is the precise violation of Bal Tosif. Such an act would be a falsification of the Torah itself, implying that God gave more than 613 mitzvot or that a specific mitzvah has a particular halacha that was not given mi'Sinai. The Rambam states, "He is not saying that the Holy One, blessed be He, commanded us to make an eruv or read the Megillah at its [appointed] time. Were he to say so, he would be adding to the Torah." [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs]. This indicates that the claim of divine origin for the substance of the new mitzvah is the issur (prohibition).
2. A Beit Din enacting an ordinance for specific reasons: This is not Bal Tosif. The Beit Din does not claim their enactment is a mitzvah given by God mi'Sinai. Rather, they, by virtue of their d'Oraita authority derived from Lo Tasur, ordain a new practice or prohibition "to recall the praise of the Holy One, blessed be He, the salvation He wrought for us, and His response to our cries" [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs]. The obligation to observe these takkanot is d'Oraita not because the takkanah itself is d'Oraita, but because the command to obey the Sages is d'Oraita. Thus, transgressing a mitzvah d'Rabbanan is a d'Oraita violation of Lo Tasur.

This chiddush provides a robust framework for Halacha's dynamic nature while preserving the immutability of the 613 mitzvot. It ensures that Chazal's authority is both divinely sanctioned and carefully circumscribed, preventing any perceived dilution of the original Sinaitic revelation.

Ramban's Critique: Bal Tosif as a State of Belief

The Ramban, in his Hassagot on Sefer HaMitzvot, Shoresh Rishon, offers a significantly different understanding of Bal Tosif and, consequently, of the relationship between Chazal's enactments and d'Oraita prohibitions. While he agrees with the Rambam that Lo Tasur empowers Chazal to legislate, he fundamentally disagrees on the nature of Bal Tosif.

• Ramban's Chiddush: For Ramban, the prohibition of Bal Tosif is violated only when one believes that an addition is an integral part of the Torah mi'Sinai. He writes, "כי האזהרה בבל תוסיף אינה אלא למי שיוסיף על דברי התורה ויחשוב אותה תוספת שהיא מפי הגבורה" (The warning of 'Do not add' is only for one who adds to the words of the Torah and believes that addition is from the mouth of the Almighty) [Hassagot HaRamban al Sefer HaMitzvot, Shoresh Rishon].
  • Since Chazal explicitly state that their enactments are d'Rabbanan (Rabbinic), and meticulously distinguish them from mitzvot d'Oraita, there is no danger of confusing the two. Therefore, the very act of enacting a takkanah or gezeirah does not, in the Ramban's view, violate Bal Tosif.
  • The Ramban does not require the Rambam's subtle distinction regarding the source of the command. For Ramban, the key is the perception and attribution. If the Beit Din clearly says "this is a Rabbinic enactment," then Bal Tosif is simply not applicable, as no one is being misled into believing it's mi'Sinai.
  • Consequently, for Ramban, transgressing a mitzvah d'Rabbanan is a Rabbinic transgression. While the obligation to listen to Chazal is d'Oraita (via Lo Tasur), the penalty for violating a Rabbinic mitzvah is not equated with violating a d'Oraita command. This leads to practical differences in Halacha, such as when d'Oraita prohibitions override d'Rabbanan ones, or in cases of sfek sfeka.

The Ramban's approach offers a more direct reading of Bal Tosif, focusing on the belief component rather than the Rambam's intricate parsing of the source of the command. Both Rishonim, however, agree on the d'Oraita obligation to obey Chazal in general, despite their differing interpretations of Bal Tosif.

Friction

The Enduring Tension: Adding Content vs. Adding Obligation

The strongest kushya (difficulty) arising from the Rambam's formulation, particularly when contrasted with the Ramban, is whether his distinction truly resolves the Bal Tosif conundrum or merely shifts the linguistic burden. If Chazal ordain a new practice, such as lighting Chanukah candles, and the Torah then commands us via Lo Tasur to observe that practice, isn't the net result an addition to the Torah's demands? The Torah now effectively obligates us in something it did not originally command. The Rambam states, "He is not saying that the Holy One, blessed be He, commanded us to make an eruv or read the Megillah at its [appointed] time. Were he to say so, he would be adding to the Torah." [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs] Yet, if we are Biblically commanded to obey Chazal, and Chazal command us to light Chanukah candles, the chain of command ultimately leads back to a d'Oraita obligation to light those candles. This seems to circumvent Bal Tosif rather than directly address the implication of a new d'Oraita obligation (even if indirect) for a novel act.

Terutz: The Rambam's Structural vs. Substantive Distinction

The Rambam's solution hinges on a crucial distinction between adding to the substantive content of the 613 mitzvot and adding to the structure of obligation through a pre-existing Torah command.

1. Substantive Content: Bal Tosif prohibits claiming that God directly commanded a new mitzvah as part of the original Sinaitic revelation. This would be to falsify the Divine word. When Chazal enact a takkanah, they do not attribute its origin to God's direct command mi'Sinai. They explicitly state it is "מדרבנן" (from the Rabbis).
2. Structural Obligation: The Torah itself, through Lo Tasur (Deuteronomy 17:11), mandates obedience to the Beit Din HaGadol. This mitzvah is part of the original 613. When Chazal legislate, they are exercising an authority granted to them by the Torah. Therefore, our d'Oraita obligation to observe their takkanot stems from the d'Oraita mitzvah of Lo Tasur, not from the takkanah itself being a d'Oraita command.

Thus, the Rambam argues that no new mitzvah is added to the 613 mi'Sinai. Rather, the Torah includes a meta-mitzvah (Lo Tasur) that empowers a dynamic halachic system. Observing mitzvot d'Rabbanan is the fulfillment of a d'Oraita command (Lo Tasur), not an addition to the 613 mitzvot. The Torah commanded us to listen to Chazal; when Chazal command us to light Chanukah candles, we are fulfilling the Torah's command to listen to them. This makes the d'Oraita obligation an indirect consequence of Lo Tasur, rather than a direct addition to the Torah's corpus of mitzvot.

Terutz: The Ramban's Focus on Intent and Belief

The Ramban's terutz is simpler, focusing on the intent and belief of the actor. Bal Tosif is about misrepresenting an addition as divine. Since Chazal never do this, and everyone understands mitzvot d'Rabbanan to be Rabbinic in origin, the prohibition is simply not triggered. The Ramban does not need the Rambam's complex interplay of Lo Tasur to avoid Bal Tosif. For him, the explicit designation of an enactment as Rabbinic is sufficient. The obligation to observe these mitzvot d'Rabbanan is indeed d'Oraita due to Lo Tasur, but the transgression of the specific mitzvah d'Rabbanan (e.g., not reading Megillah) is Rabbinic, distinct from the d'Oraita transgression of Lo Tasur itself. This nuance has significant ramifications for Halacha l'maaseh.

Intertext

The sugya of Bal Tosif and Lo Tasur is rooted in fundamental Biblical verses and is extensively discussed in classical halachic and philosophical works.

The Foundational Verses

1. Bal Tosif u'Val Tigra: "לֹא תֹסִפוּ עַל הַדָּבָב אֲשֶׁר אָנֹכִי מְצַוֶּה אֶתְכֶם וְלֹא תִגְרְעוּ מִמֶּנּוּ לִשְׁמֹר אֶת מִצְוֺת ה' אֱלֹהֵיכֶם אֲשֶׁר אָנֹכִי מְצַוֶּה אֶתְכֶם" (Deuteronomy 4:2). This verse explicitly prohibits adding to or subtracting from God's commandments. The Rambam reiterates this in the provided text as the "Torah's warning (Deuteronomy 13:11): 'Do not add to it and do not detract from it'". [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs] The Rambam's interpretation specifies that this warning is against a prophet introducing a new mitzvah in God's name.

2. Lo Tasur: "עַל פִּי הַתּוֹרָה אֲשֶׁר יוֹרוּךָ וְעַל הַמִּשְׁפָּט אֲשֶׁר יֹאמְרוּ לְךָ תַּעֲשֶׂה לֹא תָסוּר מִן הַדָּבָר אֲשֶׁר יַגִּידוּ לְךָ יָמִין וּשְׂמֹאל" (Deuteronomy 17:11). This command establishes the authority of the Beit Din HaGadol and obligates every Jew to obey their rulings, even if they appear to deviate from a literal understanding of the Torah (hence "yamin u'smol"). The Rambam uses this verse as the linchpin for the d'Oraita obligation to observe mitzvot d'Rabbanan: "We are obligated to accept and observe all these commandments which [the Rabbis] instituted, as [implied by Deuteronomy 17:11]: 'Do not deviate from the instructions that they will give you, left or right.'" [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs]

Cross-References in Mishneh Torah and Sefer HaMitzvot

The Rambam himself delves into this topic more deeply in other works:

• Sefer HaMitzvot, Shoresh Sheni: Here, the Rambam presents his detailed methodology for enumerating the 613 mitzvot, and Shoresh Sheni specifically addresses the exclusion of Rabbinic enactments from the 613. He elaborates on the distinction: Bal Tosif applies to one who claims a mitzvah is mi'Sinai when it is not, or adds to its halachot. Chazal's enactments are clearly d'Rabbanan, and the obligation to observe them stems from Lo Tasur, a d'Oraita positive commandment.
• Mishneh Torah, Hilchot Mamrim 1:1-3: This is where the Rambam systematically lays out the authority of the Beit Din HaGadol. He states, "Every Beit Din that arose after Moshe Rabbeinu until the building of the Third Temple, and they made a gezeirah or takkanah or minhag, and it spread throughout Israel, it is forbidden to deviate from it. And anyone who deviates from it, transgresses a negative commandment, as it is said, 'Lo Tasur.'" [Mishneh Torah, Hilchot Mamrim 1:2]. This directly reinforces the Rambam's view that transgressing a mitzvah d'Rabbanan is a d'Oraita violation of Lo Tasur.
• Mishneh Torah, Hilchot Chanukah 3:3 & Hilchot Megillah 1:1: These sections illustrate the Rambam's point about the reasons for Rabbinic enactments. For Chanukah, he explicitly states the takkanah was to "make known the wonders and increase praise and thanksgiving to His great name." [Mishneh Torah, Hilchot Chanukah 3:3]. This aligns with the concluding statement in our text about Megillah: "in order to recall the praise of the Holy One, blessed be He, the salvation He wrought for us..." [Mishneh Torah, Negative Mitzvot 1-122, concluding paragraphs]. These are not new mitzvot from God, but human enactments for divine praise, whose observance is mandated by the Torah's command to obey the Sages.

Psak/Practice

The Rambam's chiddush regarding Bal Tosif and Lo Tasur has profound implications for Halacha l'maaseh (practical Halacha) and meta-psak heuristics, primarily impacting the perceived severity and status of mitzvot d'Rabbanan.

• Severity of Transgression: According to the Rambam, a person who transgresses a mitzvah d'Rabbanan is not merely violating a Rabbinic decree; they are, in fact, transgressing a d'Oraita negative commandment—that of Lo Tasur. This elevates the seriousness of such a transgression to a Biblical level. While the content of the mitzvah (e.g., lighting Chanukah candles) remains Rabbinic, the obligation to perform it is ultimately rooted in the Torah. This position is reflected in Hilchot Mamrim 1:2, where he explicitly states that one who deviates from a gezeirah or takkanah transgresses a negative commandment.
• Hierarchical Prioritization: This understanding can influence how halachic dilemmas are resolved, particularly when there is a conflict between a mitzvah d'Oraita and a mitzvah d'Rabbanan. While the general principle is that d'Oraita overrides d'Rabbanan, the Rambam's view imbues mitzvot d'Rabbanan with a powerful, albeit indirect, d'Oraita force. It means that dismissing a Rabbinic enactment is not merely a slight to Chazal, but a direct affront to a Torah command.
• Meta-Psak Heuristics: The Rambam's framework emphasizes the continuous, divinely sanctioned authority of the Beit Din HaGadol in every generation. This supports the concept of Yisrael v'Oraita v'Kudsha Brich Hu chad hu (Israel, Torah, and God are one), where the living tradition and the interpretative authority of the Sages are integral to the very fabric of Torah. It implies that Halacha is not static, but a dynamic system designed to adapt and grow under the guidance of authorized Sages, all within the bounds set by the Torah itself.

In contrast, the Ramban's view, while also accepting the d'Oraita obligation of Lo Tasur, would hold that the transgression itself of the mitzvah d'Rabbanan is only Rabbinic. This distinction can be significant in areas like sfek sfeka (double doubt), where Halacha is generally more lenient regarding d'Rabbanan prohibitions than d'Oraita ones. However, even for Ramban, the overall imperative to obey Chazal remains a d'Oraita obligation. The practical psak often acknowledges the Rambam's philosophical depth while sometimes leaning towards the Ramban's distinction in specific cases of leniency.

Takeaway

The Rambam's concluding exposition on Bal Tosif and Lo Tasur masterfully articulates the dynamic authority of Chazal, grounding their enactments in a d'Oraita command to obey while safeguarding the immutability of the 613 mitzvot mi'Sinai. This intricate balance ensures the enduring relevance and adaptability of Halacha within the framework of divine revelation.