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Why do we keep two days Yom Tov outside Eretz Yisrael once we have a fixed calendar? The shiur analyzes the machlokes between Rav and Rav Assi regarding beitzah nolad on the first day: is Yom Tov Sheni a safek (two separate kedushos) or kedusha achas? The Rambam (רמב"ם) and Rashi (רש"י) offer fundamentally different readings of the sugya.
This shiur delivers a sophisticated analysis of Beitzah 4b, examining the fundamental nature of Yom Tov Sheni (the second day of Yom Tov observed in the diaspora). The Gemara (גמרא) discusses a beitzah (egg) that was born on the first day of Yom Tov—may it be eaten on the second day? The core dispute is between Rav and Rav Assi. According to Rav, if the beitzah was born on the first day, it is mutar (permitted) on the second day, because the two days represent a safek—uncertainty about which day is truly Yom Tov. According to Rav Assi, it is assur (forbidden) on both days because of "kedusha achas"—one continuous sanctity. The Gemara supports Rav Assi's position by noting that he would make havdalah between the first and second day, which seems contradictory: if it's one kedusha, why havdalah? The Gemara resolves this by saying Rav Assi himself was uncertain (safek) about the nature of Yom Tov Sheni, so he was machmir (stringent) on both sides.
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Beitzah 4b
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