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Why can't one eat matzah when accepting Yom Tov early, even though it's already the fifteenth of Nissan? The shiur develops a chiddush that the entire Seder is driven by Chag HaPesach (the fourteenth) rather than Chag HaMatzos (the fifteenth). Since Pesach (פסח) doesn't have early acceptance, the matzah mitzvah (מצוה) remains tied to actual Pesach night timing.
This shiur provides a comprehensive analysis of a complex Tosfos in Pesachim 99b dealing with the prohibition against eating matzah when accepting Yom Tov early (kabbalas Yom Tov). Rabbi Zweig begins by examining Tosfos's position that one cannot eat matzah during Tosfos Yom Tov, even though it would already be the fifteenth of Nissan according to Torah (תורה) law. The fundamental question arises: if it's already Yom Tov and the fifteenth day, why shouldn't one be able to fulfill the mitzvah (מצוה) of matzah? The shiur explores several difficulties with Tosfos's approach. First, if one has already accepted Yom Tov early, it should be considered the fifteenth day according to Torah law, making it appropriate to eat matzah. Second, the Mishna's language of 'lo yachol' (cannot) seems to indicate a prohibition rather than merely an inability to fulfill the mitzvah. Rabbi Zweig questions how there could be an actual prohibition against eating matzah once Yom Tov has begun, especially since the prohibition against eating matzah on Erev Pesach (פסח) should no longer apply.
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Pesachim 99b
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