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Can Chazal make a rabbinic decree to protect another rabbinic prohibition? The Gemara (גמרא)'s principle of "gezeira l'gezeira" appears to forbid this, yet Beitzah 3a discusses multiple such decrees. The shiur develops the yesod that certain Yom Tov prohibitions exist primarily to safeguard Shabbos (שבת), not Yom Tov itself, transforming the entire structure of muktzeh and melacha restrictions on Yom Tov.
This shiur presents a comprehensive analysis of Beitzah 3a, focusing on the fundamental principle of gezeira l'gezeira (making a rabbinic decree to protect another rabbinic prohibition) and its application to Yom Tov laws. The Gemara (גמרא) presents three cases where Amoraim suggest that an egg laid on Yom Tov should be prohibited due to secondary concerns: Rav Yosef suggests it's forbidden due to muktzeh, Rav Yitzchok due to peres hanoshrin (detached produce), and a third due to mashkin she'zavu (liquid that flowed). In each case, Abaye responds that this would constitute gezeira l'gezeira, which Rashi (רש"י) explains as creating a protective fence around a rabbinic prohibition rather than a Torah (תורה) prohibition. The fundamental question emerges: how can there be any gezeira at all protecting these rabbinic prohibitions? According to Tosafos (תוספות), lisha (kneading) on Yom Tov is biblically prohibited, making peres hanoshrin a gezeira on a Torah prohibition. However, the Rambam (רמב"ם) and Ran hold that lisha is only rabbinically prohibited on Yom Tov. This creates a significant difficulty: if the underlying prohibition is itself rabbinic, how can the Gemara permit a gezeira to protect it? This seems to contradict the very principle of gezeira l'gezeira.
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Beitzah 3a
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