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What exactly defines shavui nafshei chateichah l'isur - is it testimony or personal conviction? The shiur develops two distinct categories: an eidus-based halacha (הלכה) (objective testimony) and an issur-based halacha (subjective belief). This framework explains why the Gemara (גמרא) requires kimlei expertise in some cases but not others.
This shiur analyzes the fundamental nature of shavui nafshei chateichah l'isur through the lens of Kesubos 9b, developing a comprehensive framework that resolves numerous apparent contradictions in the Rishonim and Acharonim. Rabbi Zweig establishes that there are two distinct types of shavui nafshei: one rooted in eidus (testimony) and another in issur (personal conviction about prohibition). The first type operates as an eidus-based halacha (הלכה) where a person can testify about himself, similar to how witnesses function - though this testimony is only valid regarding the person making the statement, not for others. When someone declares themselves a kohen based on chazakah (established status from community recognition, duchan participation, etc.), this constitutes valid eidus for that individual, warranting malkos. The second type functions as an issur-based halacha, comparable to nedarim, where personal conviction about a prohibition creates a binding restriction even without objective proof.
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Kesubos 9b
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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.
