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Why does Rabbi Gamaliel accept a woman's testimony about yichud but not about shvuya (captivity)? The shiur develops the Rashbam's distinction: by yichud she retains her chezkas kashrus until proven otherwise, but by shvuya the rov goyim prutzim creates a legal presumption of nivala that removes her chazakah from the start.
The shiur analyzes the fundamental dispute between Rabbi Gamaliel and Rabbi Yehoshua regarding a woman's credibility in cases of yichud versus shvuya. The Gemara (גמרא) states that while Rabbi Yehoshua can bring a proof from shvuya to yichud, the reverse doesn't work because 'rov goyim prutzim b'arayos' by gentiles, which doesn't apply to Jews. Rabbi Yehoshua responds 'ein apitrupus l'arayos' - there's no guardian for immorality. Rashi (רש"י)'s interpretation creates a difficulty: if ein apitrupus l'arayos simply means 'you can't say lo niv'ala' (she wasn't violated), how does this constitute a proof from shvuya where we assume there was violation? The shiur resolves this by explaining that Rabbi Yehoshua's position is that once any safek exists regarding yichud, we require proper witnesses (eidim) to resolve the matter of lineage (ma'alos asur b'yuchsin).
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Kesubos 13b
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