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What changed when Chazal made a takana not to accept witnesses after Mincha on Rosh Hashanah? The shiur works through the mechanics of kedushas achas—whether the first day became vadai Yom Tov (Yisroel's reading) or remained safek but with new restrictions (Yitzchok's reading). Rashi (רש"י) and Tosafos (תוספות) disagree on which shir the Leviim sang when witnesses had already arrived.
This shiur analyzes a complex sugya in Masechta Rosh Hashanah 5a dealing with the takana that Chazal instituted regarding when to accept witnesses for Rosh Chodesh Tishrei. The Gemara (גמרא) discusses how before this takana, witnesses could come at any time during the day, which once caused a problem when they arrived after Mincha and disrupted the Tamid shel bein ha'arbayim. Chazal therefore instituted that witnesses would not be accepted after Mincha. The Gemara states that as a result, both days of Rosh Hashanah have a din of "kedushas achas"—one unified sanctity. Rabbi Zweig begins by posing the fundamental question: What practically changed before and after the takana? Before the takana, people kept the first day mi'safek—perhaps witnesses would come and it would be Yom Tov. After the takana, when witnesses cannot be accepted after Mincha anyway, what is different about how people observe the day? Why does the Gemara describe this as "kedushas achas"?
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Rosh Hashanah 5a
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