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What level of witness testimony is needed to establish that adultery occurred? The Gemara (גמרא) distinguishes between witnesses who saw mere seclusion (yichud) versus those who witnessed actual adultery, but a deeper analysis reveals a third category: seclusion with clear intention that creates a presumption of adultery.
This shiur analyzes Kesubos 13b's discussion of different levels of witness testimony regarding adultery and their respective legal consequences. The Gemara (גמרא) initially appears to distinguish between two categories: witnesses who saw only seclusion (yichud) and those who witnessed actual adultery (biah). However, Rabbi Zweig develops a fundamental insight that there exists a third, intermediate category. The shiur begins by examining the case where a woman claims her child is from a specific kohen versus claiming it's from an unspecified kohen. This leads to a novel chiddush: when she specifies the father, the child may be able to perform Temple service (avoda), unlike when she makes a general claim, where rabbinic law (din derabanan) disqualifies the child from service due to uncertain lineage (zerah meyuchas).
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Kesubos 13b
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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.
