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What level of witness testimony is needed to establish that adultery occurred? The Gemara (גמרא) distinguishes between witnesses who saw mere seclusion (yichud) versus those who witnessed actual adultery, but a deeper analysis reveals a third category: seclusion with clear intention that creates a presumption of adultery.
This shiur analyzes Kesubos 13b's discussion of different levels of witness testimony regarding adultery and their respective legal consequences. The Gemara (גמרא) initially appears to distinguish between two categories: witnesses who saw only seclusion (yichud) and those who witnessed actual adultery (biah). However, Rabbi Zweig develops a fundamental insight that there exists a third, intermediate category. The shiur begins by examining the case where a woman claims her child is from a specific kohen versus claiming it's from an unspecified kohen. This leads to a novel chiddush: when she specifies the father, the child may be able to perform Temple service (avoda), unlike when she makes a general claim, where rabbinic law (din derabanan) disqualifies the child from service due to uncertain lineage (zerah meyuchas).
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Kesubos 13b
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