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Why is one chayav separate korbanos for each melacha on Shabbos (שבת)? The shiur contrasts two approaches in the Rishonim: Rashi (רש"י) in Pesachim (thirty-nine distinct lavin derived from havoorah) versus Rashi in Yevamos (one lav of "lo sa'aseh kol melacha" divided by sevara). This chakira explains machlokos on hasra requirements for av versus tolda melachos and resolves contradictions in Tosafos (תוספות) and the Rambam (רמב"ם).
This shiur is part of a series on Masechta Bava Kamma and examines the foundational concepts of klal and toldos in the framework of Shabbos (שבת) melachos, beginning on daf 2a. The Gemara (גמרא) establishes that there are thirty-nine avos melachos on Shabbos, each with its toldos. The Gemara asks: what is the difference between an av and a tolda? If one does two different avos, one is chayav twice; if one does two different toldos, one is also chayav twice. But if one does an av and its tolda together, one is only chayav once. Rav Elazar disagrees and holds that one is chayav even when doing a tolda in the presence of its av. The question arises: what do we call an av and what do we call a tolda? The answer given is that the melachos performed in the Mishkan are called avos, while those similar but not performed in the Mishkan are called toldos. Rashi (רש"י)'s comment that "lo mechayav ela echad" (one is only liable once) is puzzling. The simple reading of the Gemara suggests that doing an av and tolda together results in one korban, not that the tolda is exempt. Rashi derives this from the continuation of the Gemara: Rav Elazar holds one is mechayav a tolda in the place of an av, implying the Chachamim hold one is not mechayav a tolda in such a case. Tosafos (תוספות) asks a fundamental question: according to the Chachamim, why must one give hasra (warning) for the tolda by mentioning the av melacha? According to Rav Elazar, who holds one is chayav for both, the question is even stronger—why mention the av when warning for the tolda?
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Bava Kamma 2a
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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.
