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Why does the Mishna present the leniency of Beis Shammai (regarding shells) rather than the stringency of Beis Hillel? The shiur analyzes Tosfos's principle that koach d'hetera adif—showing leniencies is pedagogically stronger—and contrasts it with showing the strength of isur. A key question emerges: is muktzeh on Yom Tov a single extreme ruling or an entirely new issur distinct from Shabbos (שבת)?
This shiur explores the Gemara (גמרא) in Beitzah 2a-b focusing on Tosfos's principle of koach d'hetera adif—the idea that demonstrating the power of leniency is more significant than demonstrating stringency. The Mishna presents a case where one is permitted to remove shells from the table on Shabbos (שבת), and the Gemara asks why the Mishna chooses to teach the leniency of Beis Shammai rather than the stringency of Beis Hillel. Rabbi Zweig begins by reviewing Rashi (רש"י)'s position on the Mishna. According to Rashi, shells that are not fit for human consumption (michal adam) but also not fit for animal consumption (michal behemah) should be permitted. The question is why—if they lack both forms of utility, what permits carrying them? Rabbi Zweig suggests a novel approach: items that enhance achilah (eating) acquire a din of muchon (preparedness). For instance, bones that make meat more appetizing or walnut shells that protect the nut retain a status tied to the food, even after the food is consumed. This differs from pea pods, which merely contain the food but do not enhance its presentation or consumption. The distinction is that something which facilitated or beautified the eating retains its status and may be moved, whereas something that was merely a container does not.
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Beitzah 2a-b
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