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Why don't Chazal believe a woman who explains her suspicious conduct with an unknown man? The machlokes between Rabbi Yehoshua and Rabban Gamaliel isn't about ma'alos biyuchsin itself, but about women's ne'emanus in genealogical matters. Both agree that genealogical concerns override normal rules of rov and chezkas kashrus.
This shiur provides an in-depth analysis of Kesubos 105a, focusing on the fundamental concept of ma'alos biyuchsin (elevation of genealogical standards). Rabbi Zweig begins by establishing that the entire sugya deals not with Torah (תורה)-level prohibitions, but with rabbinic stringencies regarding genealogical concerns - specifically when we suspect a woman may have been intimate with someone unfit for her to marry. The core dispute between Rabbi Yehoshua and Rabban Gamaliel centers on a woman's credibility. When a woman is seen secluded with a man (midaberet) and questioned about his identity, Rabbi Yehoshua doesn't believe her testimony, while Rabban Gamaliel does. Rabbi Zweig emphasizes that this disagreement is not about the scope of ma'alos biyuchsin itself, but solely about whether the woman has ne'emanus (credibility) in such circumstances.
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Kesubos 105a
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