1 Chronicles 23:30-32

30They also stood in a designated place every morning and offered thanks and praise to the Lord. They also did this in the evening

31and whenever burnt sacrifices were offered to the Lord on the Sabbath and at new moon festivals and assemblies. A designated number were to serve before the Lord regularly in accordance with regulations.

32They were in charge of the meeting tent and the holy place, and helped their relatives, the descendants of Aaron, in the service of the Lord’s temple.