Daniel 9:1-3

In the first year of Darius, the son of Assuerus, of the seed of the Medes, who reigned over the kingdom of the Chaldeans:

The first year of his reign I, Daniel, understood by books the number of the years, concerning which the word of the Lord came to Jeremias, the prophet, that seventy years should be accomplished of the desolation of Jerusalem.

And I set my face to the Lord, my God, to pray and make supplication with fasting, and sackcloth, and ashes.