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How does maalas biyuchsin (stringencies in lineage matters) apply when a woman was secluded with someone of unknown status? The shiur develops that this isn't about whether we're stringent with lineage, but about whether her testimony is believed - both Rav Gamaliel and Rabbi Yehoshua agree on the stringency itself.
The shiur begins by analyzing why the Mishna specifically mentions nasar and mamzer as examples of men who would disqualify a woman for marriage to a Kohen, when these cases are much rarer than other disqualifying relationships. The analysis reveals that when discussing a pregnant woman (m'uberes), according to Rabbi Yehoshua the child would be a shtuki - someone whose father is unknown - and would be disqualified from marrying into the general population due to rabbinic decree (miderabanan), not because of the Torah (תורה) prohibition on mamzerim. The Gemara (גמרא)'s dispute between Ziri and Rav Asi centers on the meaning of 'midaberes' - whether it means mere seclusion (yichud) or actual relations (nivela). Rashi (רש"י) indicates that even without witnessing actual relations, the woman is disqualified according to Rabbi Yehoshua because of maalas biyuchsin. This principle means the Sages suspended normal rules of chazaka (presumptions) and rov (majority) that would normally permit the woman, creating a stringency even when there's only a suspicion.
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Kesubos 15b
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Why does the Gemara present a kal v'chomer for chuppah making kiddushin based on kesef not being maichel b'terumah, only to reject it? The shiur reveals that even the rejected kal v'chomer establishes a fundamental yesod: kiddushin is a kinyan for ishus (marital relationship), not merely a kinyan in hilchos kinyanim. The second kal v'chomer—from chuppah being gomeres—raises Tosafos's famous question.
Is the kesef used in kiddushin a true kinyan (acquisition), or merely a symbolic means of establishing marriage? The shiur analyzes multiple interpretations of the Gemara's derivation from ki yikach ki'ach mi'Sayeffron, exploring whether marriage constitutes ownership, and develops three fundamental approaches: (1) The Gemara proves ishus is a kinyan, (2) ishus is not a kinyan but uses kinyan-like means, or (3) ishus is a kinyan but the kesef may not be a ma'aseh kinyan. The Rambam's position—calling kesef "midivrei sofrim"—is explained as distinguishing between cross-referencing concepts versus borrowing terminology.
Why does the Mishna alternate between the language of "kinyan" (acquisition) and "kiddushin" (sanctification) when describing marriage? The shiur develops a fundamental distinction: marriage has two separate aspects—a kinyan dimension (ownership) and a kedusha dimension (sanctified relationship). Either aspect can initiate the bond, and understanding this dual nature resolves multiple textual and halachic questions throughout the sugya.
Does kiddushei shetar require a shevah pruta? The Ran presents two approaches to the Rif's position. The shiur develops the Ran's second pshat that shetar kiddushin functions as a hachnah (exchange) rather than a mere kinyan nesina. This reading has profound implications for isuri hana'ah, mechubar, and the relationship between kesef and shetar.
