1 Chronicles 23:30-32

23:30 They also stood in a designated place every morning and offered thanks and praise to the Lord. They also did this in the evening 23:31 and 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. 23:32 They 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.