Mishneh Torah, Levirate Marriage and Release 3-5

Sugya Map

• Issue: The limits of a husband's/wife's testimony concerning marital status and the obligation of yibbum (levirate marriage) or chalitzah.
• Core Tension: The intersection of Migo (credibility based on the power to act otherwise) and Chezkas Issur (presumptive prohibitions).
• Nafka Mina: Can a husband’s claim of having sons free his wife from yibbum? Does the same logic apply to a wife claiming the death of her yavam (brother-in-law)?
• Primary Sources: Yevamot 117a–118a; Bava Batra 134b; Rambam, Hilchot Yibbum VaChalitzah 3:1–5; Shulchan Aruch, Even HaEzer 156–157.

Text Snapshot

Rambam (Hilchot Yibbum 3:1): "When a man says: 'This is my son,' or 'I have sons,' his word is accepted... and he frees his wife from [the obligation of] yibbum or chalitzah."

• Nuance: The phrase "his word is accepted" (ne’eman) rests on the mechanism of Migo. The Rambam identifies the Migo as the husband’s ability to divorce his wife (get), rendering her exempt from yibbum anyway. This implies the husband’s claim is not an act of testimony (edut) in the standard sense, but a declaration of status enabled by his pre-existing legal authority.

Readings

1. The Ohr Sameach (Hilchot Yibbum 3:1)

The Ohr Sameach grapples with a fundamental kushya: If the husband’s credibility is based on the Migo that he could have given a get, does that Migo suffice if the result of his current statement is that the woman becomes forbidden to a Kohen? (A woman who receives a get is forbidden to a Kohen, but a woman released from yibbum by her husband’s claim of children is not necessarily restricted in that specific way). He concludes that because the husband has the power to achieve the "greater" legal consequence (the get), he is trusted for the "lesser" one. He distinguishes this from Bava Batra by noting that where the husband can perform the act effectively, he is ne'eman on the whole, and Migo functions even for partial claims (Migo l’chatzi ta’anah).

2. The Ramban (Hilchot HaRamban, Bava Batra ch. 8)

The Ramban challenges the reliance on Migo here. He argues that the husband’s credibility does not stem from a mechanical Migo (the ability to divorce), but from a svara of social reality: the husband has no interest in his wife being "anchored" (agunah) or trapped in yibbum. He suggests that the Sages accepted his word because he is demonstrably acting in the woman's best interest. This shifts the focus from the legal "power to act" to the psychological "lack of motive to deceive," a subtle but vital distinction in how we weigh ne'emanut in matters of ishut.

Friction

The Strongest Kushya: If the husband is trusted via Migo because he could have divorced her, why is the wife not trusted when she claims her husband died, or that her yavam died, given that she is equally motivated to be free of yibbum?

The Terutz: The Maggid Mishneh clarifies that Migo is only effective when the party has the legal power to create the status they claim. A husband has the power to issue a get, which unilaterally creates the status of "divorced woman." A wife, however, has no such power to unilaterally alter her status regarding yibbum. Because she lacks the legal ko’ach to effect the change, her Migo is empty. Furthermore, as Rambam notes in 3:11, the prohibition against marrying while under yibbum obligation is a "negative commandment" (lav), and the Sages feared the woman would be "casual" (meiklah) with her testimony to escape the yavam. Thus, we apply a stricter evidentiary standard to the woman than to the man.

Intertext

• Bava Batra 134b: The Talmudic basis for ne'emanut regarding children. The debate centers on whether the husband is believed because he could have given his property away (matanah) or because he could have divorced his wife.
• Even HaEzer 156:6: The Shulchan Aruch codifies the Rambam’s ruling, but the Beit Shmuel adds the crucial distinction: if the husband's claim contradicts an existing chazakah (presumption) of childlessness or brother-presence, the Migo of the get is insufficient. This mirrors the Rambam’s insistence in 3:3 that Migo cannot override a chazakah.

Psak/Practice

The meta-psak heuristic here is the Hierarchy of Presumptions. In matters of yibbum, a "prevailing presumption" (chazakah) regarding the status of the family (e.g., the presumed existence of brothers) acts as a high-threshold barrier. Even a Migo—a powerful tool in civil law—is treated with extreme caution by the poskim when it threatens to override the chazakah of yibbum. In practice, the beit din will almost never rely on unilateral claims without corroborating testimony if a chazakah is in play, effectively rendering the "husband's word" a tool for clarification, not a replacement for investigative due diligence.

Takeaway

The law of yibbum transforms the husband's testimony from a subjective claim into a legal instrument, provided he possesses the autonomous power to effect that status through other means (get). When the wife speaks, she lacks that mechanism, and the law pivots to protect the chazakah of the yavam with ironclad rigor.