Ezra 6:16-22

And all Israel—the priests, the Levites, and the rest of the [former] exiles—celebrated the dedication of this house of God with joy. They offered at the dedication of this house of God 100 bulls, 200 rams, 400 lambs, and, as a sin offering for all Israel, 12 male goats, according to the number of Israel’s tribes. Then they appointed the priests to their divisions and the Levites in their orders for the service of God at Jerusalem, as it is written in the book of Moses. The [former] exiles kept the Passover on the fourteenth [day] of the first month. For the priests and the Levites had purified themselves together; all of them were [ceremonially] clean. So they slaughtered the Passover lamb for all the exiles, for their brothers the priests, and for themselves. The Passover was eaten by the sons (descendants) of Israel (Jacob) who returned from exile and by all those who had separated themselves from the [ceremonial] uncleanness of the nations of the land to join them, in order to seek the LORD God of Israel. They observed the Feast of Unleavened Bread for seven days with joy, for the LORD had caused them to rejoice and had turned the heart of the king of Assyria toward them, so that he encouraged them and strengthened their hands in the work of the house of God, the God of Israel.