Daniel 9:1-3

In the first year of Darius son of Xerxes (a Mede by descent), who was made ruler over the Babylonian kingdom— in the first year of his reign, I, Daniel, understood from the Scriptures, according to the word of the LORD given to Jeremiah the prophet, that the desolation of Jerusalem would last seventy years. So I turned to the Lord God and pleaded with him in prayer and petition, in fasting, and in sackcloth and ashes.