1 Chronicles 23:30-32

LITV(i) 30 and to stand every morning to thank and praise Jehovah, and likewise at evening. 31 And they were to offer all burnt sacrifices to Jehovah in the sabbath, in the new moons, and on the set feasts, by number, according to the order commanded to them, continually before the face of Jehovah, 32 and that they should keep the charge of the tabernacle of the congregation, and the charge of the Holy Place, and the charge of Aaron's sons, their brothers, in the service of the house of Jehovah.