Numbers 1:47-50

47But the Levites were not registered with them by their ancestral tribe.

48For the Lord had told Moses,

49“Do not register or take a census of the tribe of Levi with the other Israelites.

50Appoint the Levites over the tabernacle of the testimony, all its furnishings, and everything in it. They are to transport the tabernacle and all its articles, take care of it, and camp around it.