Ezra 6:19-22 - The Celebration Of Passover
19 And the children of the captivity held Passover upon the fourteenth day of the first month: 20 for the priests and Levites had purified themselves, so that they were all clean as one man, and killed Passover for all the children of the captivity, and for their brethren the priests, and for themselves. 21 And the children of Israel which were come again out of captivity, and all such as had separated themselves unto them from the filthiness of the Heathen in the land, to seek the LORD God of Israel, ate 22 and held the feast of unleavened bread seven days with joy: for the LORD had made them glad, and turned the heart of the king of Assyria unto them, so that their hands were strengthened in the work of the house of God, which is the God of Israel.