Ezra 6:20-21

Thomson(i) 20 For the priests and the Levites had purified themselves till all were pure. And the Levites killed the paschal lambs for all the children of the captivity, and for their brethren, the priests, and for themselves. 21 So the children of Israel who were of the captivity, and every one who had separated himself from the impurity of the nations of the land and had come to them to seek the Lord God of Israel, ate the passover,