Numbers 1:50; Numbers 1:53

50 "But you shall appoint the Levites over the tabernacle of the testimony, and over all its furnishings and over all that belongs to it. They shall carry the tabernacle and all its furnishings, and they shall take care of it; they shall also camp around the tabernacle.

53 "But the Levites shall camp around the tabernacle of the testimony, so that there will be no wrath on the congregation of the sons of Israel. So the Levites shall keep charge of the tabernacle of the testimony."