Numbers 1:50, 53

But appoint the Levites over the tabernacle (sanctuary) of the Testimony, and over all its furnishings and all things that belong to it. They shall carry the tabernacle [when traveling] and all its furnishings, and they shall take care of it and camp around it.

But the Levites shall camp around the tabernacle of the Testimony, so that there will be no wrath against the congregation of the Israelites. The Levites shall be in charge of the tabernacle of the Testimony.”