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What distinguishes cases where bari v'shema gives the bari an advantage versus cases where it doesn't? The shiur develops a fundamental distinction: bari v'shema only works between competing claimants (baalei dinim), not when one party is a shomer aveida who must return property to its rightful owner. A shomer needs actual proof (raayah), not just a superior argument.
This Gemara (גמרא) shiur analyzes the principle of bari v'shema (certain vs. uncertain claims) and explores why it doesn't apply uniformly across all cases. The discussion centers on Kesubos 12b and addresses a fundamental question raised by Tosafos (תוספות): why does bari v'shema sometimes give the certain party (bari) an advantage, while in other cases it does not? The shiur begins by establishing the basic framework: when someone has a strong claim (tainas bari) supported by chazakah (presumptive ownership), a challenger needs actual proof (raayah) to remove the property. However, when the holder only has an uncertain claim (tainas shema), the challenger needs only a reason, not full proof, to prevail.
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Kesubos 12b
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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.
