'Seventy' in the Bible

in the first year of his reign, I Daniel understood by the books that the number of the years, whereof the word of Jehovah came to Jeremiah the prophet, for the accomplishment of the desolations of Jerusalem, was seventy years.

Seventy weeks are apportioned out upon thy people and upon thy holy city, to close the transgression, and to make an end of sins, and to make expiation for iniquity, and to bring in the righteousness of the ages, and to seal the vision and prophet, and to anoint the holy of holies.