Mishneh Torah, Vows 7-9

Sugya Map: The Paradox of Mitzvah-Benefit

• Core Issue: When a vow of hana’ah (benefit) clashes with a mandatory mitzvah or communal obligation.
• Nafka Mina: Is a mitzvah performance a "benefit" derived from one's colleague, or is the benefit purely halachic/obligatory?
• Primary Sources: Nedarim 4:2, 48a, 83b; Mishneh Torah, Vows 7:1-11.

Text Snapshot

• MT, Vows 7:1: "When two people are forbidden... to derive benefit from each other, they are allowed to return a lost article to each other, because doing so is a mitzvah."
• Nuance: The Rambam clarifies in his Commentary to the Mishnah that the return is permitted not because the hana’ah is absent, but because the mitzvah overrides the vow’s restriction. The Ohr Sameach (7:1:1) notes the tension: if he accepts a reward, he is clearly deriving personal benefit, thus the reward must be diverted to the Temple/Charity.

Readings

• Rambam (MT 7:1): The chiddush is the "Temple Treasury" mechanism. If an action is both a mitzvah and carries a personal benefit (the reward), we decouple the mitzvah (permitted) from the benefit (forbidden).
• Ramban/Ran (on 7:8): They challenge the Rambam’s ruling regarding communal property (like a synagogue), arguing that if a space cannot be divided, it is not "communal property" in the sense of ownership, but a public utility that remains permissible to all, regardless of the vow.

Friction

Kushya: If the return of a lost object is a mitzvah, why is the reward forbidden? If the reward is part of the mitzvah ecosystem, shouldn't it be permitted as part of the mitzvah fulfillment? Terutz (Ohr Sameach): The mitzvah is the act of returning, not the profit. The moment a reward is accepted, the act shifts from mitzvah-performance to service-for-hire. The Rambam insists on the "purity of motive"—the mitzvah only grants immunity from the vow if the benefit is strictly limited to the mitzvah itself.

Intertext

• SA, Yoreh De'ah 224:1: Codifies the Rambam/Ramban debate, maintaining that communal property (synagogues) is generally permissible to the mudar (the one who took the vow) because they share a non-divisible right to the space.

Psak/Practice

The heuristic is functional separation. When an obligation (returning a lost object, giving terumah) involves personal gain, we must sever the financial benefit from the act. If you cannot return an object without a fee, you must waive the fee or donate it to charity to maintain the mitzvah status and avoid the issur of hana’ah.

Takeaway

Vows are linguistic; mitzvot are ontological. A vow cannot inhibit a command of the Torah, but it can force you to purify your motives—stripping away personal profit from mandatory actions to ensure the mitzvah remains untainted by the forbidden relationship.