New answers tagged messiah
The Shai LaMorah, on Tannah D'vei Eliyahu Zuta 20:6, explains that Hashem will reveal yet-unknown reasons for the Mitzvos and the Torah. Our newfound understanding of the reasons will make it seem as if there's a new Torah. He cites the Iyun Tefillah on the yotzer of Parshas Hachodesh.
To answer your last question first, logic dictates that when someone comes who fulfills all the requirements of the Mashiach, then we will know that he is of the line of Zerubavel. Rambam Hilchos Melachim (Chapter 11) Halacha 1 starts In future time, the King Moshiach  will arise and renew the Davidic dynasty, restoring it to its initial ...
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