Study Sanhedrin folio 97B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
That is the course that history was to take, but due to our many sins, the Messiah did not come after 4,000 years passed, and furthermore, the years that elapsed since then, which were to have been the messianic era, have elapsed.
Elijah the prophet said to Rav Yehuda, brother of Rav Sala Ḥasida: The world will exist no fewer than 85 Jubilee cycles, or 4,250 years. And during the final Jubilee, the son of David will come. Rav Yehuda said to Elijah: Will the Messiah come during the beginning of the Jubilee or during its end?
Rav Ḥanan bar Taḥlifa sent a message to Rav Yosef: I found one man, and in his hand there was one scroll written in Ashurit script and in the sacred tongue, Hebrew. I said to him: From where did this scroll come into your possession? He said to me: I was hired to serve in the Roman army and I found
§ It is taught in a baraita that R' Natan says: This verse penetrates and descends until the depths; just as the depths are unfathomable, so too, the period depicted in the following verse is unquantifiable. “For the vision is yet for the appointed time; and it declares of the end, and does not lie
The Messiah will come not in accordance with the opinion of our Rabbis, who would interpret the verse: “For a period and periods and a half period” (Daniel 7:25), to mean that the duration of the ultimate exile will be 3½ times the duration of the period of the exile in Egypt.