1 Chronicles 23:30-32

30They are to stand every morning to thank and to praise the Lord, and likewise at evening,

31and to offer all burnt offerings to the Lord, 1on the sabbaths, the new moons and 2the fixed festivals in the number set by the ordinance concerning them, continually before the Lord.

32Thus 3they are to keep charge of the tent of meeting, and charge of the holy place, and 4charge of the sons of Aaron their 5relatives, for the service of the house of the Lord.