Mishneh Torah, Foundations of the Torah 5

Sugya Map

• Issue: The scope of Pikuach Nefesh regarding forced transgression, specifically the Rambam's assertion that one who dies rather than transgress a non-cardinal sin (when ya'avor v'al yehareg applies) is "מתחייב בנפשו" (held accountable for his life).
• Nafka Mina(s): When is self-sacrifice mandated, permitted, or forbidden? What is the halachic status of choosing death when not required?
• Primary Sources: Mishneh Torah, Foundations of the Torah 5:1; Vayikra 18:5 ("וחי בהם"); Devarim 6:5 ("בכל נפשך"); Yerushalmi Shevi'it 4:2; Bavli Ketubot 3a.

Text Snapshot

"ואם מת ולא עבר הרי זה מתחייב בנפשו." — Mishneh Torah, Foundations of the Torah 5:1:1

• Dikduk/Leshon Nuance: The phrase "מתחייב בנפשו" is potent. It's not merely that one's act of self-sacrifice is supererogatory or unnecessary; it implies a culpability, an issur, for willingly forfeiting one's life. This is a far stronger claim than merely stating one is "רשאי להחמיר" (permitted to be stringent), as some Rishonim suggest.

Readings

• Peri Chadash (MT 5:1:1): Challenges the Tosafot and Rosh (Ketubot 27b) who hold one may be stringent on oneself. The Peri Chadash argues, citing the Yerushalmi (Shevi'it 4:2) regarding R' Abba, that choosing death where ya'avor v'al yehareg applies is improper, as the Yerushalmi implies R' Abba should have eaten neveilah. He concludes the Rambam's position is correct: one must transgress. He makes an exception for "גדולי הדור" (great leaders), who may sacrifice themselves.
• Seder Mishnah (MT 5:1:1): Highlights the Rambam's consistency by noting this principle is reiterated in Halacha 4, underscoring its centrality in his halachic framework.

Friction

• Kushya: The Rambam's assertion that one who dies rather than transgress "מתחייב בנפשו" appears to directly contradict the view of Tosafot and Rosh (Ketubot 27b) who famously state, "אם רצה להחמיר על עצמו רשאי" (if one wishes to be stringent on oneself, he is permitted). This creates a fundamental dispute regarding the nature of ya'avor v'al yehareg – is it a mere permission, or an obligation?
• *Terutz (Peri Chadash, ibid.):* The Peri Chadash resolves this by arguing that the Yerushalmi (Shevi'it 4:2), which critiques R' Abba for refusing neveilah under duress ("אי הוה מקיים מילי דרבנן הוה אכיל"), supports the Rambam. This indicates that choosing death when ya'avor v'al yehareg applies is indeed an issur, not merely a chumra. The Peri Chadash carves out a limited exception for "גדולי הדור," allowing them to be moser nefesh due to their unique stature, but this is not a general allowance.

Intertext

• Yerushalmi Shevi'it 4:2: Relates the incident of R' Abba who refused to eat neveilah when threatened, but the Yerushalmi implies that had he "fulfilled the words of the Sages," he would have eaten. This provides a crucial textual basis for the Rambam's stringent interpretation of "וחי בהם."
• Bavli Ketubot 3a: Discusses oness (coercion) during sh'at shmad, particularly regarding women. It provides context for the distinction between sh'at shmad (decree to nullify faith) and hana'at atzmo (gentile's personal benefit), further delineating when yeharg v'al ya'avor applies.

Psak/Practice

The Rambam's strong language, "מתחייב בנפשו," solidifies the normative halacha: one is generally obligated to transgress rather than die, except for Avodah Zarah, Giluy Arayot, Shefichat Damim, or during a public sh'at shmad. This transforms pikuach nefesh from a mere leniency into a chiyuv, emphasizing the paramount value of Jewish life.

Takeaway

The Rambam's "מתחייב בנפשו" is a stark reminder that pikuach nefesh is not merely a permission, but an imperative; choosing death when not required is a transgression against the principle of "וחי בהם ולא שימות בהם."