In koheles Rabba piska 11 ois 8 It says that "The Torah we have now is hevel-nothing compared to the Torah of moshiach".
Why is this Torah considered nothing? What is the Torah of moshiach mean?
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The prophet Ieshaiahu perek 51 pasuk 4 says: "Attend unto Me, O My people, and give ear unto Me, O My nation: כי תורה מאתי תצא". Chachomim explained this as referring to the time of geulah. In the words of midrash vaycra rabba 13:3: תורה חדשה מאתי תצא, חידוש תורה מאתי תצא
Or as stated by Yalkut Shimoni 429:
עתיד הקב"ה להיות יושב... ודורש תורה חדשה שעתיד ליתן על-ידי משיח
This mean that when moshiach comes, the knowledge of Torah he will reveal, transcends whatever will have been revealed until then. From this p.o.v., the quantification of moshiach's Torah will be an extraordinary revelation to be considered a "new torah" (Cf. Midrash Talpiot 58a).