Numbers 1:49-52

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.

51Whenever the tabernacle is to move, the Levites are to take it down, and whenever it is to stop at a campsite, the Levites are to set it up. Any unauthorized person who comes near it is to be put to death.

52“The Israelites are to camp by their military divisions, each man with his encampment and under his banner.