13The sons of Amram: Aaron and Moses; and Aaron was set apart, he and his sons forever, that he should sanctify the most holy things, to burn incense before the LORD, to minister to Him, and to give the blessing in His name forever.
24These were the sons of Levi by their fathers’ houses—the heads of the fathers’ houses as they were counted individually by the number of their names, who did the work for the service of the house of the LORD, from the age of twenty years and above.
28because their duty was to help the sons of Aaron in the service of the house of the LORD, in the courts and in the chambers, in the purifying of all holy things and the work of the service of the house of God,
29both with the showbread and the fine flour for the grain offering, with the unleavened cakes and what is baked in the pan, with what is mixed and with all kinds of measures and sizes;
31and at every presentation of a burnt offering to the LORD on the Sabbaths and on the New Moons and on the set feasts, by number according to the ordinance governing them, regularly before the LORD;
32and that they should attend to the needs of the tabernacle of meeting, the needs of the holy place, and the needs of the sons of Aaron their brethren in the work of the house of the LORD.