Numbers 4:3

3 afrom thirty years old up to fifty years old, all who can come on duty, to do the work in the tent of meeting.

1 Chronicles 23:24-32

24 bThese were the sons of Levi by their fathers’ houses, the heads of fathers’ houses cas they were listed according to the number of the names of the individuals from dtwenty years old and upward who were to do the work for the service of the house of the Lord. 25For David said, β€œThe Lord, the God of Israel, ehas given rest to his people, and he dwells in Jerusalem forever. 26And so the Levites no longer need fto carry the tabernacle or any of the things for its service.” 27For by the last words of David the sons of Levi were numbered from gtwenty years old and upward. 28For their duty was to assist the sons of Aaron for the service of the house of the Lord, having the care of the courts and the chambers, the cleansing of all that is holy, and any work for the service of the house of God. 29Their duty was also to assist with the hshowbread, the iflour for the grain offering, the wafers of unleavened bread, the jbaked offering, the koffering mixed with oil, and all lmeasures of quantity or size. 30And they were to stand every morning, thanking and praising the Lord, and likewise at evening, 31and whenever burnt offerings were offered to the Lord mon Sabbaths, nnew moons, and feast days, oaccording to the number required of them, regularly before the Lord. 32Thus pthey were to keep charge of the tent of meeting and the sanctuary, and to attend the sons of Aaron, their brothers, for the qservice of the house of the Lord.

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