Ezra 6:16-22

16 Then the people of Israel, the priests, the Levites, and the others who had returned from exile celebrated at the dedication of God's temple.
17 At the dedication of God's temple, they sacrificed 100 bulls, 200 rams, and 400 lambs. They sacrificed 12 male goats as an offering for sin, one goat for each of the tribes of Israel.
18 The priests were assigned to their divisions and the Levites to their groups [to lead] the worship of God in Jerusalem by following the directions written in the Book of Moses.
19 On the fourteenth day of the first month, those who had returned from exile celebrated the Passover.
20 Since the priests and Levites had cleansed themselves, all of them were [now] clean. They killed the Passover lambs for all the people who had returned from exile, for the rest of the priests, and for themselves.
21 The lambs were eaten by the Israelites who had returned from exile and by all who had separated themselves from the unclean practices of the non-Jews in the land to worship the LORD God of Israel.
22 So for seven days they celebrated the Festival of Unleavened Bread because the LORD had made them joyful. The LORD had made the king of Assyria change his mind so that he supported the people in their work on the temple of God, the God of Israel.