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When selling a beit knesset to buy a Sefer Torah (תורה) covering, may the proceeds be used for Nevi'im? The shiur analyzes the machlokes between the Ramban (רמב"ן) and Ran on whether ma'alin b'kodesh applies to the kedusha of the object itself or to the mitzvah (מצוה) performed with it. A fascinating analysis of Rashi (רש"י)'s citation of the Tosefta reveals a second principle: upgrading the mitzvah (e.g., Talmud (תלמוד) Torah) can justify a transaction even when the object's kedusha decreases.
This shiur presents an in-depth analysis of the opening Mishna in Megillah 25b, which discusses the laws of selling communal property and objects with varying levels of kedusha. The Mishna establishes a hierarchy: proceeds from selling a rechov ha'ir (town square) may be used to purchase a beit knesset; proceeds from a beit knesset may purchase a teivah (ark); from a teivah one may buy mitpachas (Torah (תורה) covering); from mitpachas one may buy sefarim (books); and from sefarim one may buy a Sefer Torah. However, one may not reverse this process and use proceeds from a higher-kedusha item to purchase a lower one. Rabbi Zweig begins by questioning why Rashi (רש"י) cites a Tosefta rather than the Gemara (גמרא) Menachos, which explicitly provides the source for ma'alin b'kodesh v'lo moridin (we elevate in holiness but do not downgrade). The Gemara Menachos derives this principle from the construction of the Mishkan, showing that items can be elevated from one level of kedusha to another, but never reduced. Rashi, however, brings a different Tosefta that cites two pesukim: one about Moshe erecting the Mishkan (representing elevation) and another about the sinners' belongings being used for the altar (also representing elevation, not degradation).
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Megillah 25b
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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.
