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Can valid lineage (yichus) be established through probability (rov) or only through certainty (vadai)? The shiur develops that ma'alos hayuchsin requires vadai proof - you cannot create a Kohen through rov alone. This explains why chazakah works better than rov for yichus: chazakah preserves an existing vadai status, while rov only creates probability.
This shiur examines a complex sugya in Kesubos 13b dealing with the fundamental question of how Jewish lineage (yichus) can be established, particularly regarding Kohanim. The central issue revolves around whether lineage can be created through rov (majority/probability) or requires vadai (certainty). The Gemara (גמרא) discusses a case where a woman claims her child is from a particular man. Rabbi Yehoshua says if he admits it (chad da kamoida), the child's status is established. However, the shiur analyzes the tension between this and other halachic principles regarding yichus.
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Kesubos 13b
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