Numbers 1:52-54

1:52 “The Israelites will camp according to their divisions, each man in his camp, and each man by his standard. 1:53 But the Levites must camp around the tabernacle of the testimony, so that the Lord’s anger will not fall on the Israelite community. The Levites are responsible for the care of the tabernacle of the testimony.”

1:54 The Israelites did according to all that the Lord commanded Moses – that is what they did.