Ezra 6:21-22

21The Israelites who were returning from the exile ate it, along with all those who had joined them in separating themselves from the uncleanness of the nations of the land to seek the Lord God of Israel.

22They observed the Feast of Unleavened Bread for seven days with joy, for the Lord had given them joy and had changed the opinion of the king of Assyria toward them, so that he assisted them in the work on the temple of God, the God of Israel.