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Why does Rabbi Yehoshua challenge Rabbi Gamliel's ruling about marriage when the majority are unfit? The shiur analyzes the fundamental dispute about whether probability (rov) creates certainty or merely permits action. This leads to a deeper understanding of why yuchsin requires absolute certainty, not just statistical likelihood.
The shiur analyzes a complex sugya from Kesubos 13b dealing with the laws of marriage and lineage verification. The primary discussion centers around a dispute between Rabbi Gamliel and Rabbi Yehoshua regarding when a woman can marry a kohen despite uncertainty about her status. Rabbi Gamliel permits marriage even when there's a majority of unfit people (rov pasul), while Rabbi Yehoshua objects based on a comparison to the laws of shevuya (captive women). The shiur examines Rashi (רש"י)'s interpretation that Rabbi Yehoshua's challenge focuses specifically on the case where the majority are unfit, questioning how Rabbi Gamliel can permit marriage in such circumstances. A fundamental principle emerges from the analysis: there are two different applications of rov (majority). According to one approach, rov creates a halachic permission to act based on probability, but doesn't establish absolute certainty. This distinction becomes crucial in marriage laws (ma'alei u'yuchsin), where absolute certainty is required to prevent the creation of chalal offspring. The shiur explores the Rosh's position that while rov permits eating potentially kosher food, it doesn't create a vadai (certain) status. This explains why probability might be sufficient for dietary laws but insufficient for lineage matters, where even statistical likelihood cannot override the need for certainty. The discussion extends to the related sugya in Kidushin, where Avishol appears to disagree with Rabbi Gamliel about cases involving rov pasul. Tosfos attempts to reconcile the apparent contradiction between the sugyot, but the shiur presents an alternative approach following the Rambam (רמב"ם)'s understanding. According to this reading, the distinction lies between cases where the woman is pregnant (muberet) versus cases involving a child already born, with different standards applying to each situation. The analysis concludes with an examination of chazakah (presumptive status) and its role in these determinations, particularly how the mother's chazakah can or cannot extend to establish the status of her child depending on the circumstances.
Kesubos 13b
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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.
