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When yichud creates doubt about a woman's status, what standard of proof does ma'alos ubiyuchsin require? The shiur develops a fundamental chakira between Rav Gamaliel and Rabbi Yehoshua on whether halachic presumptions suffice or we need absolute factual certainty to preserve kehunah's integrity.
The shiur analyzes a fundamental dispute in Kesubos 13a regarding the requirements of ma'alos ubiyuchsin (elevated standards for lineage matters). The Gemara (גמרא)'s initial question centers on a contradiction: if Ziri holds that Rabbi Yehoshua prohibits yichud because of ma'alos ubiyuchsin (we cannot rely on presumptions in lineage matters), how can this be reconciled with Rav's position that yichud creates no prohibition? Rabbi Zweig develops a crucial distinction between different types of halachic certainty. He explains that there are legal presumptions (chazakos) that create halachic realities, similar to how we legally assume a person walking down the street is not a treifa when determining capital punishment. These legal realities differ from absolute factual knowledge. The Gemara initially thought that such legal presumptions would satisfy even Rabbi Yehoshua's stringent requirements for ma'alos ubiyuchsin.
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Kesubos 13a
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