Ezra 6:18-22

6:18 They appointed the priests by their divisions and the Levites by their divisions over the worship of God at Jerusalem, in accord with the book of Moses. 6:19 The exiles observed the Passover on the fourteenth day of the first month. 6:20 The priests and the Levites had purified themselves, every last one, and they all were ceremonially pure. They sacrificed the Passover lamb for all the exiles, for their colleagues the priests, and for themselves. 6:21 The 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. 6:22 They 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.