1 Chronicles 23:30-32

30They are also to stand every morning to give thanks and praise to the Lord, and likewise in the evening.

31Whenever burnt offerings are offered to the Lord on the Sabbaths, New Moons, and appointed festivals, they are to offer them regularly in the Lord’s presence according to the number prescribed for them.

32They are to carry out their responsibilities for the tent of meeting, for the holy place, and for their relatives, the descendants of Aaron, in the service of the Lord’s temple.”