Numbers 1
51 Ref And when the Tent of meeting goes forward, the Levites are to take it down; and when it is to be put up, they are to do it: any strange person who comes near it is to be put to death.
52 Ref The children of Israel are to put up their tents, every man in his tent-circle round his flag.
53 Ref But the tents of the Levites are to be round the Tent of meeting, so that wrath may not come on the children of Israel: the Tent of meeting is to be in the care of the Levites.