Numbers 1:51-53

51 Whenever the tabernacle is to move, the Levites are to take it down, and whenever the tabernacle is to be set up, the Levites shall do it. Anyone else who goes near it shall be put to death.

52 The Israelites are to set up their tents by divisions, each man in his own camp under his own standard.

53 The Levites, however, are to set up their tents round the tabernacle of the Testimony so that wrath will not fall on the Israelite community. The Levites are to be responsible for the care of the tabernacle of the Testimony."