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The Gemara (גמרא) asks why chalipin doesn't work for kiddushin when it works by Sde Efron. Tosafot explains the havamina held chalipin (when worth a shever pruta) works mi-tam kesef, making it a form of kesef kinyan. The maskana rejects this: chalipin is a separate kinyan (kinyan acher), not a form of kesef, which explains why it doesn't work for kiddushin where only kesef is valid.
This shiur presents an in-depth analysis of Tosafot on Kiddushin 3a, examining the fundamental question of whether chalipin (barter-exchange) operates as a form of kesef (monetary acquisition) or as an entirely separate kinyan. The discussion centers on understanding both the Gemara (גמרא)'s havamina (initial assumption) and its maskana (conclusion). The Gemara's question is straightforward: if chalipin works to acquire Sde Efron, why shouldn't it work for kiddushin? Tosafot explains that the Gemara's havamina was that chalipin functions mi-tam kesef—that is, chalipin operates on the principle of kesef, making it essentially a kesef-type kinyan. According to this understanding, since kesef works for kiddushin, chalipin should work as well. The critical qualification, however, is that Tosafot limits this to chalipin sheyesh bo shever pruta—barter involving an object worth at least a minimal value.
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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.
