Ezra 6:20-21

20For 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 brethren the priests, and for themselves.

21And the children of Israel, which were come again out of the captivity, and all such as had separated themselves unto them from the filthiness of the heathen of the land, to seek the LORD, the God of Israel, did eat,