Numbers 18:4

4They shall join you and keep guard over the tent of meeting for all the service of the tent, aand no outsider shall come near you.

1 Chronicles 23:28-32

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 bshowbread, the cflour for the grain offering, the wafers of unleavened bread, the dbaked offering, the eoffering mixed with oil, and all fmeasures 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 gon Sabbaths, hnew moons, and feast days, iaccording to the number required of them, regularly before the Lord. 32Thus jthey were to keep charge of the tent of meeting and the sanctuary, and to attend the sons of Aaron, their brothers, for the kservice of the house of the Lord.

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