Numbers 1:53
But the Levites shall pitch round about the tabernacle of testimony, that there be no wrath on the congregation of the children of Israel: and the Levites shall keep the charge of the tabernacle of testimony.
Torrey's Topical Textbook—AKJV

Numbers 3:23,29,35
The families of the Gershonites shall pitch behind the tabernacle westward.
Torrey's Topical Textbook—AKJV