I have held off asking this question for a while because I have only seen the premise in parsha flyers at chabad but a chance look at Wikipedia gave me the sources (below).

It is said that certain mitzvos will be nullified in the time of the Mashaich.

How then, will God be able to communicate his will that certain mitzvos are nullified?

  1. If God sends a prophet, if a prophet attempts to nullify a mitzva, he is considered false prophet.
  2. If God uses a "voice from heaven," we already have a precedent that voices from heaven don't influence halacha (lo ba shamaim hi).
  3. If God makes everyone "know" that the Mitzvos are nullified, they still can't go against halacha or vote on it.

The majority view of classical rabbis was that the commandments will still be applicable and in force during the Messianic Age. However, a significant minority of rabbis held that most of the commandments will be nullified by, or in, the messianic era. Examples of such rabbinic views include:

  • that today we should observe the commandments (Babylonian Talmud, Tractate Avodah Zarah 3a, 4b); because we will not observe them in the world to come (Rashi)
  • that in the future all sacrifices, with the exception of the Thanksgiving-sacrifice, will be discontinued (Midrash Vayikra Rabbah 9:7)
  • that all sacrifices will be annulled in the future (Tanchuma Emor 19, Vayikra Rabbah 9:7)
  • that God will permit what is now forbidden (Midrash Shochar Tov, Mizmor 146:5)
  • that most mitzvot will no longer be in force (Babylonian Talmud, Tractate Niddah 61b and Tractate Shabbat 151b).
  • @ezra There are numerous rabbinical mitzvoth that are done zecher lemikdash. There are various opinions whether many of these would apply once the mikdash is restored. – DanF Sep 15 '17 at 19:21
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    A rabbinical mitzva is very simple to nullify post Mashiach. Just revive the Tannaim and they can vote on it. – Clint Eastwood Sep 15 '17 at 19:25
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    @ClintEastwood - And just because it's nullified doesn't mean we won't continue to observe it. The Avos weren't obligated in mitzvos but yet they observed them. – ezra Sep 15 '17 at 19:27
  • Your middle three sources are Midrashim, which aren't exactly used directly for ruling on Halachos. And while I haven't investigated your two Talmudic quotes, just based on the snippet of the quote from the first source, I could very easily see it referring to the afterlife (the next world; when a person passes away) (although as mentioned earlier, I have not investigated these sources fully). – Salmononius2 Sep 15 '17 at 20:13
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    Avodah Zarah 3a, 4b does not indicate that mitsvos will no longer be binding, only that the opportunity to fulfill them will cease. (as illustration, If their is no time, the time bound mitzvos are not applicable, without altering one iota of Halacha). This could about through incorporeality for annother example. – Naftali Tzvi Sep 15 '17 at 20:24

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