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Why doesn't tov b'divar mitzvah (מצוה) apply to making tzitzis on Shabbos (שבת)? The shiur develops a fundamental distinction between mitzvos that enhance the day itself (shofar, lulav) versus those that enhance objects (tzitzis, mezuzah). Only day-enhancing mitzvos can override Shabbos because they actually define and elevate that very day rather than desecrating it.
This shiur analyzes a complex piece of Gemara (גמרא) Shabbos (שבת) 130ab dealing with the concept of tov b'divar mitzvah (מצוה) and why it doesn't apply to making tzitzis on Shabbos. The discussion begins with the fundamental question: why doesn't the principle of tov b'divar mitzvah (exemption from bringing a korban when violating Shabbos while performing a mitzvah) apply to someone who ties tzitzis on Shabbos? The Maharsha's approach is examined, suggesting that carrying a shofar on Shabbos is mere ignorance (am ha'aratzus) rather than a mistaken application of tov b'divar mitzvah. A significant insight emerges connecting this to the concept of mitzvah b'aveira - when a mitzvah itself is not docheh (doesn't override) Shabbos, performing it on Shabbos creates a mitzvah b'aveira that must be undone, negating any accomplishment. This is contrasted with milah, which is docheh Shabbos, so even improper performance doesn't become mitzvah b'aveira. The shiur develops a novel understanding of the Gemara's question about kavua zman, suggesting it relates to mitzvos that enhance the day itself versus those that enhance objects. Mitzvos like shofar, lulav, sukkah, and matzah create and define their respective days (Yom Teruah, Chag HaSukkos, Chag HaMatzos), while tzitzis and mezuzah enhance garments and houses respectively. This fundamental distinction explains why only day-enhancing mitzvos can override the prohibition of desecrating that very day. The analysis extends to Reb Eliezer's position on chibbuv mitzvah, interpreting it as demonstrating how performing milah on Shabbos actually enhances Shabbos rather than desecrating it. The discussion concludes with an examination of Rashi (רש"י)'s interpretation of ho'al b'yado l'hafkir (it's in his power to declare it ownerless), questioning why the Gemara needed this complex formulation rather than simply stating that one is never obligated to perform these mitzvos.
Shabbos 130ab
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