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Why can't you sell a Sefer Torah (תורה) to buy another Sefer Torah? The Gemara (גמרא) Megillah 25b develops the halacha (הלכה) of ma'alin bakodesh v'lo moridin, prohibiting both downgrading and lateral movement. The shiur builds a fundamental chakira: is this prohibition rooted in kedushah of the cheftza that cannot be diminished, or in bizayon mitzvah (מצוה)—showing disrespect by selling without purpose? This distinction drives machlokos about bedieved cases and explains the Mishna's structure.
The shiur analyzes a Mishna in Megillah (25b) that establishes a clear hierarchy of kedusha for communal religious items: rechov ha'ir (city street used for prayer), beit knesset (synagogue), teivah (Torah (תורה) ark), mitpachot (Torah coverings), sefarim (Nevi'im and Ketuvim), and Sefer Torah. The Mishna states that proceeds from selling an item can only be used to purchase something of higher kedusha—ma'alin bakodesh v'lo moridin. Rashi (רש"י) explains that both principles—ma'alin (ascending) and lo moridin (not descending)—are derived from psukim. The Gemara (גמרא) in Menachos teaches ma'alin from the mach'tos (fire pans) of Korach's assembly that were elevated to become part of the Mizbeach, and lo moridin from Moshe Rabbeinu erecting the Mishkan (rather than lesser individuals). Rabbi Zweig raises a fundamental question: why are two separate drashos needed? Once we establish ma'alin bakodesh—that one must go up in kedusha—doesn't lo moridin follow automatically? What does the prohibition against descending add that ascending doesn't already cover?
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Megillah 25b
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