Daniel 9:1-2

In the first year of Darius, the son of Ahasuerus, of the seed of the Medes, who was made king over the kingdom of the Chaldaeans; In the first year of his rule, I, Daniel, saw clearly from the books the number of years given by the word of the Lord to the prophet Jeremiah, in which the making waste of Jerusalem was to be complete, that is, seventy years.