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Can safek ones versus safek rotzon create a case where a woman remains mutar to her husband? The shiur develops Rashi (רש"י)'s crucial distinction between mezanah berotzon (which violates cheskas tzadekes) and being talked into something (pitui), which preserves righteousness while still creating an issur. This reading resolves the Rosh's fundamental challenge about cheskas tzadekes.
The shiur analyzes a complex Gemara (גמרא) in Kesubos 9a dealing with the case of pesach (פסח) pasuach matzasi - a husband who discovers his wife was not a virgin. The core issue is whether this creates a safek safeka (double doubt) or a single safek, and the resulting halachic status. Rashi (רש"י) explains that the case assumes the woman is now a gedolah (adult), because if she were still a katanah (minor), pitui katan would be considered ones (coercion), making her permitted to her husband. Rabbi Zweig notes that Rashi adds the word "gedolah" which doesn't appear explicitly in the Gemara, but is necessary to avoid contradiction with other sugyos.
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Kesubos 9a
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