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Why does our Gemara (גמרא) say mifkad pokeach exempts from mefarek while another Gemara rules it obligates? The shiur resolves this contradiction by distinguishing two types of mefarek: one derived from dosh requiring tikkun ha'ochel, and another learned from milah requiring only separation.
The shiur addresses a fundamental contradiction in Talmudic rulings regarding the melacha of mefarek (extracting). Our Gemara (גמרא) states that if blood is mifkad pokeach (loosely attached), one is exempt from mefarek, but the Gemara in Sukkah rules that extracting wine from grapes or oil from olives (both mifkad pokeach) does obligate for mefarek. Rabbi Zweig analyzes this through the Rambam (רמב"ם)'s position that the melacha discussed here is mefarek, not nesilas neshama as Tosafos (תוספות) holds. The resolution centers on distinguishing two distinct types of mefarek. The first type, derived from the av melacha of dosh (threshing), requires both that one needs the extracted substance (tzorech ha'dam) and that it constitutes a tikkun ha'ochel (improvement of food). This is exemplified by extracting grain from chaff - taking something useful from something unusable. When extracting blood by wounding, if done merely to harm (miskaven la'hazik), it's considered mekalkel (destructive) rather than tikkun, even if the blood could theoretically be used.
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Kesubos 5b
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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.
