1 Chronicles 23:30-32

30They were appointed to stand to give thanks and praise to the Lord every morning. They were appointed to do the same thing in the evening.

31They were appointed to stand in front of the Lord in the required numbers whenever burnt offerings were made—on weekly days of rest—holy days, at New Moon Festivals, and on appointed annual festivals.

32They were appointed to follow the regulations for the tent of meeting and the holy place and to help their relatives, Aaron’s descendants, as they served in the Lord’s temple.