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When is bari v'shema (certain vs. uncertain claims) decided by superior evidence versus superior claims? The shiur develops two approaches in Rishonim - one where bari v'shema works through raaya (proof), another where it works through better ta'ana (claim). This distinction resolves contradictions between different sugyos and explains when migo works.
This shiur provides an extensive analysis of the fundamental machloket regarding bari v'shema (when one party claims certainty while another claims uncertainty) in Kesubos 12b. Rabbi Zweig develops two competing approaches found in the Rishonim to understand when and why the certain claimant wins. The first approach treats bari v'shema as a question of raaya (proof) - the bari wins because his certainty constitutes better evidence of what actually occurred. The second approach treats it as a matter of ta'ana (claims) - the bari wins not because we know the facts, but because he presents a superior claim that deserves recognition by beis din. The shiur demonstrates how this fundamental distinction resolves numerous apparent contradictions in the Gemara (גמרא). When our sugya says 'ukim mamon b'chezkas marei' (leave the money with its current holder), this reflects the ta'ana approach - beis din isn't determining facts but recognizing that the uncertain party lacks a real claim. By contrast, when Bava Kamma says 'hamotzi chaver al hara'aya,' this reflects the raaya approach where proof is required.
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Kesubos 12b
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