When Moshiach arrives and the Beis Hamikdash is Rebuilt and the Avodah starts again will we be required to fast on Yom Kippur? (please provide sources for your answers)
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4Well it says in the Torah to fast on Yom Kippur, so I don't know why that would change when mashiach comes.– DanielCommented Oct 3, 2014 at 19:18
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They fasted the last couple times we had a temple...– Double AA ♦Commented Oct 3, 2014 at 19:18
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Editing in why you think the Torah will change when Mashiach comes would greatly improve your question.– Double AA ♦Commented Oct 3, 2014 at 19:19
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1Honestly there is no reason it is just the part I dread most– user7156Commented Oct 3, 2014 at 19:24
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4inspired by this? "Our Sages teach that when the Messiah arrives the festivals will cease to be observed, but Purim will continue to be observed. The Midrash (Mishlei 9) derives this unusual conclusion from a statement in Megillat Esther, (9:28) “the memory of Purim will never cease from among their descendants.”" As Y"K is a "festival" in some sense, will it be observed and is fasting part of the festival or something separate?– rosendsCommented Oct 3, 2014 at 19:31
1 Answer
This does not mean that the festivals in the Torah will be abolished, but that the appreciation of the miracles and the redemption that occurs when the Mashiach comes and the temple is rebuilt will overshadow them. However, the Halachos of the Torah (including Yom Kippur) will continue.
As an example chabad says
The Midrash (Mishlei 9:2) teaches: "All the festivals will be annulled in future time, except for Purim." The future revelation of Divinity will be so intense that the revelation currently evinced by the festivals will be as insignificant as a midday candle. Purim, however, will be the exception, because the Purim miracle was called forth by the year-long self-sacrifice of the Jewish people of that time. (They could have averted Haman's decree by apostasy.) Their self-sacrifice evoked a Divine reaction so sublime that even in the future time it will never be annulled.
The gemoro in Rosh Hashana 18b discusses what will happen to the fasts decreed for the destruction of the temple after the temple is rebuilt and Bnei Yisroel are free of the oppression of the nations. These are the only fasts that will be changed to feasts or will be annulled.