So the Israelites who had come back from exile ate it, and with them everyone who had separated himself from the uncleanness of the nations of the land to join them in seeking Yahweh, the God of Israel.
In context
19The returned exiles kept the Passover on the fourteenth day of the first month. 20For the priests and the Levites had purified themselves together; all of them were clean. They slaughtered the Passover lamb for all the returned exiles, for their fellow priests and for themselves. 21So the Israelites who had come back from exile ate it, and with them everyone who had separated himself from the uncleanness of the nations of the land to join them in seeking Yahweh, the God of Israel. 22And for seven days they kept the Festival of Unleavened Bread with joy, because Yahweh had made them glad and had turned the heart of the king of Assyria toward them, so that he strengthened their hands in the work on the house of God, the God of Israel.