Numbers 1:52-54
Numbers 1: 52 to 54
52 The Israelites shall pitch their tents by their companies, every man by his own camp and every man by his own [tribal] standard.
53 But the Levites shall encamp around the tabernacle of the Testimony, that there may be no wrath upon the congregation of the Israelites; and the Levites shall keep charge of the tabernacle of the Testimony.
54 Thus did the Israelites; according to all that the Lord commanded Moses, so they did.