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What does "lidei shaveh li" (it's worth that to me) mean when redeeming a firstborn son with an object worth less than five selaim in the market? The shiur develops multiple approaches to understanding whether pidyon haben requires market value or personal benefit, analyzing Tosfos, the Ran, Beit Yosef, and Rambam (רמב"ם)'s divergent positions on the relationship between price and value.
This shiur explores Kiddushin 8a's discussion of the principle of "lidei shaveh li" (it's worth that to me) in the context of pidyon haben. The Gemara (גמרא) presents a case where Rav Kahana, a gavra rabbah (great person), accepted a sudra (head covering) worth three selaim as if it were worth five for pidyon haben by declaring "lidei shaveh li." Tosfos raises a fundamental question: what is the difference between lidei shaveh li and matana al menat lehachzir (a gift on condition to return)? In both cases, the object doesn't have its full value to the recipient—yet matana al menat lehachzir is valid for pidyon haben. Why should lidei shaveh li be different?
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Kiddushin 8a
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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.
