Ezra 6:19-22 - The Celebration Of Passover
19 The children of the captivity kept the Passover on the fourteenth [day] of the first month. 20 For the priests and the Levites had purified themselves together; all of them were pure: and they killed the Passover for all the children of the captivity, and for their brothers the priests, and for themselves. 21 The children of Israel who had come again out of the captivity, and all such as had separated themselves to them from the filthiness of the nations of the land, to seek Yahweh, the God of Israel, ate, 22 and kept the feast of unleavened bread seven days with joy: for Yahweh had made them joyful, and had turned the heart of the king of Assyria to them, to strengthen their hands in the work of the house of God, the God of Israel.