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How does the principle of "kol kavua k'machtzah al machtzah dami" affect both ritual law and criminal intent? The shiur analyzes whether safek tumah in different domains follows the same logic as criminal culpability, exploring whether "probably tamei" constitutes safek or vadai status and how kavua impacts kavanah in capital cases.
This shiur provides an intensive analysis of Kesubos 15a, focusing on the fundamental principle of "kol kavua k'machtzah al machtzah dami" (anything fixed is considered as half and half) and its far-reaching applications across different areas of halacha (הלכה). The discussion begins with examining cases of safek tumah in reshus hayachid versus reshus harabim, questioning why the Gemara (גמרא) needs to derive certain halachos from the principle of kavua when they might be derivable from basic principles of safek. A central kashe emerges: if rov (majority) is considered merely safek (doubtful) rather than vadai (certain), then perhaps the halacha that safek tumah in reshus harabim is tahor doesn't stem from kavua at all, but from the basic principle that anything less than vadai tumah should be considered safek. This leads to a sophisticated analysis of what constitutes "safek" - does it mean exactly 50-50, or does it include any probability less than certainty?
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Kesubos 15a
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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.
