Numbers 1:51-53

⁵¹When it's time to move the Tabernacle, the Levites shall take it down, and when it's time to make camp, the Levites shall put it up. Any outsider who goes near it must be put to death.

⁵²The Israelites are to make camp according to their tribal divisions, each person in their own camp under their own flag.

⁵³But the Levites are to set up their camp around the Tabernacle of the Testimony to stop anyone making me angry with the Israelites. The Levites are responsible for looking after the Tabernacle of the Testimony.”