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What creates the obligation to go "up" in kedusha when selling a shul or its ritual objects? The shiur develops a fundamental machloket: according to Rashi (רש"י) it stems from the mitzvah (מצוה) performed there, but the Rambam (רמב"ם) and Tur understand it as rooted in kedushas Beis HaKnesses itself—a distinction that reshapes how we read the entire Mishna and understand which objects possess kedusha.
This shiur presents a comprehensive analysis of Megillah 25b and the principle of ma'alin bekodesh—the requirement to "ascend" in matters of holiness. The Mishna discusses the sale of communal religious property: one may sell a street to buy a shul, a shul to buy an aron (ark), proceeding upward through teivah, mitpachos (Torah (תורה) coverings), and sefarim to ultimately acquire a Sefer Torah. The Gemara (גמרא) further addresses whether a street where people pray has kedusha. The shiur identifies a fundamental machloket Rishonim about what drives the halacha (הלכה) of ma'alin bekodesh. Rashi (רש"י) understands that kedusha derives from the mitzvah (מצוה) of tefillah performed in a location. Therefore, according to Rashi, a rechov shel ir (city street) would have kedusha if people davened there regularly (tadir), but lacks kedusha if used only infrequently (ein tadir). The Rambam (רמב"ם) and Tur, however, rule that a street has no kedusha at all because it is merely an arai (temporary overflow space) and was never established (lo nikba) as a makom tefillah—it is not a Beis HaKnesses. According to them, the requirement of ma'alin bekodesh applies only to an actual Beis HaKnesses and its component parts, not to any place where tefillah happens to occur.
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Megillah 25b
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