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Does Tosefes Yom Tov create actual sanctity of the day or only affect personal behavior? The shiur analyzes contradictory Tosfos regarding early acceptance to develop a framework with two dimensions: changing the day's essential nature versus changing individual obligations. This chakira resolves puzzling differences about when mitzvos can be fulfilled early.
Rabbi Zweig begins with a comprehensive analysis of Tosefes Yom Tov (early acceptance of holidays) by examining a Tosfos on Pesachim 99b. The Tosfos asks why the Mishna specifically states "Erev Pesach (פסח)" regarding the prohibition to eat matzah, and concludes that normally one should be able to eat matzah if accepting Pesach early, just as one can fulfill the mitzvah (מצוה) of Seudah on Shabbos (שבת) when accepting Shabbos early. However, matzah has a special restriction from the gezeiras hakasuv of "balaila" (at night) regarding Korban Pesach, which extends to matzah through a hekesh. This leads to a fundamental question: what is the nature of Tosefes Yom Tov? The shiur contrasts this with another Tosfos in Sukkah (27a) that permits marrying off one's daughter on Erev Shabbos even though the actual wedding feast cannot be done on Shabbos. This Tosfos distinguishes between melacha prohibitions (which apply to Tosefes) and simchas Yom Tov (which does not apply to Tosefes). This creates a contradiction with the first Tosfos, which assumes one can fulfill Seudas Shabbos early.
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Pesachim 99b
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