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Why must the shofar on Rosh Hashanah be kafuf (curved)? The Gemara (גמרא) reveals that kafuf serves the kiyum of tefillah embedded in the mitzvah (מצוה) of shofar. Rashi (רש"י) and Tosafot debate whether kafuf is me'akev: is it merely l'chatchilah (lacking tefillah but retaining shofar), or does a straight shofar invalidate the entire mitzvah? The shiur develops the chiddush that tefillah is intrinsic to the cheftza of shofar on Rosh Hashanah.
This Gemara (גמרא) shiur on Rosh Hashanah 26b analyzes the fundamental nature of the shofar used on Rosh Hashanah and Yovel, focusing on whether it must be kafuf (curved) or pashut (straight). The shiur explores a deep machloket between Rashi (רש"י) and Tosafot about whether the requirement of kafuf is me'akev (essential) or merely l'chatchilah (preferred). The Gemara distinguishes between the shofar of Rosh Hashanah and the chatzotzrot (silver trumpets) used on ta'anit (fast days). Rashi explains that the chatzotzrot serve the function of "mikra ha'edah" - gathering the people - which is fundamentally different from the shofar's role on Rosh Hashanah. The shiur emphasizes that the shofar on Rosh Hashanah embodies three distinct kiyumim: the basic mitzvah (מצוה) of shofar, zecher l'Akedat Yitzchok (remembrance of the binding of Isaac), and tefillah (prayer).
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Rosh Hashanah 26b
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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.
