Ezra 6:16-22

And the sons of Israel, the priests, the Levites and the rest of the exiles, celebrated the dedication of this house of God with joy. They offered for the dedication of this temple of God 100 bulls, 200 rams, 400 lambs, and as a sin offering for all Israel 12 male goats, corresponding to the number of the tribes of Israel. Then they appointed the priests to their divisions and the Levites in their orders for the service of God in Jerusalem, as it is written in the book of Moses. The exiles observed the Passover on the fourteenth of the first month. For the priests and the Levites had purified themselves together; all of them were pure. Then they slaughtered the Passover lamb for all the exiles, both for their brothers the priests and for themselves. The sons of Israel who returned from exile and all those who had separated themselves from the impurity of the nations of the land to join them, to seek the LORD God of Israel, ate the Passover. And they observed the Feast of Unleavened Bread seven days with joy, for the LORD had caused them to rejoice, and had turned the heart of the king of Assyria toward them to encourage them in the work of the house of God, the God of Israel.