Jeremiah 25:11

11. Seventy years Used not as a round number, nor primarily for its symbolical import, but with chronological exactness. The accuracy of this number is attested by both sacred and profane chronology. It begins with the fourth year of Jehoiakim, 606 B.C., and extends to the first year of Cyrus, 536 B.C. The whole period of the Babylonian empire after the fall of Nineveh was about sixty-seven years. Add the two years of Darius the Mede, (Daniel 6:1,) and we have about sixty-nine years for the captivity before the accession of Cyrus, near the beginning of whose reign came the decree of release and restoration. See an excellent resume of the chronological data in Keil’s Commentary.