1 Chronicles 23:27-32

27For by the last words of David the Levites were numbered from twenty years old and above:1 28Because their office was to wait on the sons of Aaron for the service of the house of the LORD, in the courts, and in the chambers, and in the purifying of all holy things, and the work of the service of the house of God;2 29Both for the showbread, and for the fine flour for meat offering, and for the unleavened cakes, and for that which is baked in the pan, and for that which is fried, and for all measures of volume and size;3 30And to stand every morning to thank and praise the LORD, and likewise at evening; 31And to offer all burnt sacrifices to the LORD on the sabbaths, in the new moons, and on the set feasts, by number, according to the order commanded to them, continually before the LORD: 32And that they should keep the charge of the tabernacle of the congregation, and the charge of the holy place, and the charge of the sons of Aaron their brethren, in the service of the house of the LORD.