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Why does the Torah (תורה) need a pasuk to teach that shaveh kesef (equivalent value) works for kiddushin? The shiur explores competing Rishonim frameworks: whether the issue is that shaveh kesef lacks intrinsic value (making hasgamah create worth), or that it's not the specific object the Torah required. The conclusion distinguishes between Tosfos's cheftza-based approach and other Rishonim's value-based understanding.
This intensive Gemara (גמרא) shiur on Kiddushin 3a examines the fundamental question of shaveh kesef ki-kesef—why the Torah (תורה) requires a pasuk to teach that an object worth the value of kesef (silver/money) can effect kiddushin. The Gemara asks several kushyos: if the Torah says kesef, we should know that shaveh kesef works; additionally, why specify "shaveh kesef" when just saying "kesef" would suffice; and finally, we already learn shaveh kesef from the case of eved Ivri (Hebrew servant). Rabbi Zweig begins by mapping the terrain of Rishonim. The Ramban (רמב"ן), Rashba, and Ran all ask these fundamental questions, and Tosfos adds additional difficulties from the case of the kohen (who accepted an agol for pidyon haben) and from the Braisa itself which validates shaveh kesef. A critical question emerges: we accept ledavdis shevel (personal valuation)—that if something is worth more to you than the market price, that subjective value counts for mitzvos like pidyon haben—yet Tosfos demands a pasuk for shaveh kesef ki-kesef even at market value. How can personal valuation create halachic value without any pasuk, while market-value equivalence requires scriptural authorization?
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Kiddushin 3a
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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.
