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How can a husband be mekane his wife not to seclude herself with a non-Jew if Rabbeinu Tam holds bias akum doesn't create issur? The shiur develops an achshavah framework: forced relations with a goy are like bias behemah (no gilui arayos), but when done willingly, she's machshiv the goy as a Jewish husband replacement.
This shiur analyzes a fundamental contradiction in Rabbeinu Tam's position on bias akum (relations with a non-Jew). According to the Rivam's understanding, Rabbeinu Tam holds that bias akum is like bias behemah - completely permitted to the husband with no din of yeharag v'al ya'avor. However, this creates a major difficulty: the Gemara (גמרא) and Rambam (רמב"ם) clearly state that a husband can be mekane (warn) his wife not to seclude herself with a non-Jew (mekane al yedei akum). How can this kinui be valid if there's no underlying issur d'oraita? The Rambam's position in Hilchos Yesodei HaTorah suggests there's no yeharag v'al ya'avor for bias akum, yet in Hilchos Sotah he rules that kinui al yedei akum is valid. This contradiction is compounded by the Rambam's principle that kinui only applies when there's an actual issur - as he states regarding a katan or behemah, 'ein osrin oso alav' (they don't prohibit her to him).
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Kesubos 3b
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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.
