Numbers 1:50, 53

Instead put the Levites in charge of the Holy Tent of the Agreement and everything that is with it. They must carry the Holy Tent and everything in it, and they must take care of it and make their camp around it.

But the Levites must make their camp around the Holy Tent of the Agreement so that I will not be angry with the Israelites. The Levites will take care of the Holy Tent of the Agreement.”