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What does hovel ishatrei ishatrei really mean—that one prohibition permits another, or that Torah (תורה) won't let a new prohibition undermine an existing heter? The Gemara (גמרא)'s language suggests the latter: when Torah removes a prohibition for yibum, no subsequent prohibition (like achos isha) can interfere. This reading resolves questions from the Binas Sodom (chometz-flavored milk) and Magen Avrohom (burning kelayim on yom tov).
This shiur presents an in-depth analysis of the Gemara (גמרא) in Yevamos 6a concerning the principle of hovel ishatrei ishatrei (הותר בהיתירא איתירא), exploring when one prohibition's removal permits what would otherwise remain forbidden. The core question is: what exactly does this principle mean, and when does it apply? The Gemara's basic case involves yibum (levirate marriage). Normally, a man's brother's wife (eshes ach) is forbidden, and so is his wife's sister (achos isha). The Gemara explores scenarios where someone marries a woman (nasa meis), she dies, and then he marries her sister (nasa chai)—or vice versa. When does the prohibition of achos isha or eshes ach apply, and when is it overridden by the yibum obligation?
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Yevamos 6a
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