Editing Mitzvot Become Nullified in the Future Time (section)

==== Time of Cancellation ====
The Ya'avetz proves that the time of the cancellation of mitzvot will be at the resurrection of the dead (and not immediately after the coming of Mashiach), and relies on the fact that in several Talmudic discussions it is evident that even after the coming of Mashiach mitzvot will be fulfilled. For example: from Rabbi Yochanan ben Zakkai's concern that prohibited eating new grain during the exile on the 16th of Nissan for fear that they would err out of habit when the Temple would be rebuilt. This proves that even after the coming of Mashiach and the building of the Temple, all the obligations of mitzvot will apply. The Alter Rebbe wrote according to this approach in his letter printed in the Tanya. Some wanted to reconcile the contradiction between Rabbi Yochanan's approach and his approach in Tractate Sanhedrin (mentioned below, that in the future they will give terumot to Aaron the Kohen), based on the explanation that the time of Aaron's resurrection will be at the beginning of the Messianic era before the resurrection of all Israel, and at this time they will still observe and fulfill all the mitzvot. And the cancellation of mitzvot will only be at the resurrection of the dead.

However, there are early authorities from whose words it seems that the time of cancellation will already be in the Messianic era; the Ramban in his commentary on the Torah explains that about the Messianic era, the Sages said: "And the years arrive, of which you will say 'I have no desire in them'" (Ecclesiastes 12:1), "these are the days of the Messiah, which have neither merit nor obligation." And there are those who believe that this is also according to Rashi, who explains that merit and obligation are poverty and wealth. And according to this approach, they necessarily hold like the approach of Rav Acha in the Jerusalem Talmud that the building of the Temple in the future will be before the Messianic era, and therefore Rabbi Yochanan decreed on the prohibition of the day of the waving. The Rebbe writes that one could say regarding the Ramban's approach "that sometimes even the duration of the resurrection of the dead is called the Messianic era and this is what he is talking about, though this is difficult."

There are various midrashim that designate periods in which certain mitzvot will be permitted, such as the prohibition of pig or the prohibition of niddah and the like. The Rebbe explains, based on what was explained above that the cancellation of all mitzvot will be after the resurrection of the dead, that these midrashim describe the period before the resurrection of the dead after the coming of Mashiach, a period in which the fulfillment of mitzvot will be complete and nevertheless some of the mitzvot will be permitted.