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When an egg is laid on Sunday after Shabbos (שבת), why is it forbidden? The shiur analyzes a fundamental dispute between Rashi (רש"י) and Tosafot on the nature of the prohibition of hachana (preparation). Rashi holds the issur is in eating something unprepared from chol; Tosafot holds it's an issur to actively prepare on one day for the next.
The shiur presents a deep analysis of the prohibition of hachana (preparation) from Shabbos (שבת) to Yom Tov and vice versa, focusing on Beitzah 2b. The central question revolves around an egg laid on Sunday following Shabbos, which is forbidden. The Gemara (גמרא) states "kol beitzah de'misialde idna me'esro gamrolo" — any egg laid today was completed yesterday. Rabba derives from this the issur hachana. Rabbi Zweig develops a fundamental dispute between Rashi (רש"י) and Tosafot on the nature of this prohibition. According to the initial reading of the Gemara, the issur hachana appears to be a prohibition against Shabbos preparing for Yom Tov — ein Shabbos meichin l'Yom Tov. This would mean the issur is located in the act of preparation itself, in the activity done on day one for day two.
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Beitzah 2b
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