The families of the Gershonites shall pitch behind the tabernacle westward.
Numbers 1:53
and the Levites encamp round about the tabernacle of the testimony; and there is no wrath on the company of the sons of Israel, and the Levites have kept the charge of the tabernacle of the testimony.
Numbers 2:17
And the tent of meeting -- the camp of the Levites -- hath journeyed in the midst of the camps; as they encamp so they journey, each at his station by their standards.