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How can a mother's chazakah help determine her daughter's marriageability to a Kohen? The Gemara (גמרא) says "cheskas eim mahani lebas" but the mechanics seem impossible—the mother's chazakah tells us she can't be disqualified from marrying a Kohen, but doesn't resolve who the father was. The shiur develops that the daughter becomes a chalala only if the mother becomes a zonah, so when we rule the mother isn't a zonah (due to her chazakah), the daughter can't be a chalala either.
This shiur analyzes a complex Gemara (גמרא) in Kesubos 13a-13b dealing with the principle of "cheskas eim mahani lebas" (the mother's chazakah benefits the daughter). The central question is how a mother's presumptive status can help determine whether her daughter may marry a Kohen when there's uncertainty about the father's identity. The Gemara discusses a case where both mother and daughter are believed when they testify about their marriageability. Rashi (רש"י) explains this means they're permitted to marry Kohanim. The Shach learns that regarding Kohanim, this involves a safek d'oraisa (biblical doubt), while for regular Jews it's only safek d'rabbanan (rabbinic doubt).
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Kesubos 13a-13b
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