2CH 31:2

2 Hezekiah divided the priests and [other] descendants of Levi into groups. He appointed some of the groups to offer sacrifices that would be completely burned [on the altar] and offerings to maintain fellowship [with Yahweh]. He appointed some groups to do other work at the temple: some to lead the people in their worship, some to thank Yahweh, and some to sing songs to praise to Yahweh at the gates of the temple.