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When does a positive commandment override a prohibition? The shiur examines Yevamos 3b's principle of aseh doche lo taaseh, contrasting Rashi (רש"י)'s understanding (one acts to gain credit while protected by ones) with an alternative approach that prioritizes active fulfillment over passive observance. The analysis extends through Rambam (רמב"ם)'s rulings on Shabbos (שבת), Yom Tov, and shofar.
This shiur provides an in-depth analysis of the Talmudic principle of aseh doche lo taaseh (a positive commandment overrides a negative commandment) as it appears in Yevamos 3b, examining the conceptual foundations of when and why a mitzvat aseh takes precedence over a lo taaseh. Rabbi Zweig opens by discussing a difficulty in Rashi (רש"י)'s reading of the Gemara (גמרא) regarding Esther and the prohibition of a Jew marrying a non-Jew. The question centers on why the Gemara frames the issue as aseh doche lo taaseh v'aseh (a positive commandment overriding both a negative and positive commandment) rather than simply addressing the underlying halachic problem.
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Yevamos 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.
