Numbers 1:49-51 New Revised Standard Version (NRSV)
49 Only the tribe of Levi you shall not enroll, and you shall not take a census of them with the other Israelites. 50 Rather you shall appoint the Levites over the tabernacle of the covenant,[a] and over all its equipment, and over all that belongs to it; they are to carry the tabernacle and all its equipment, and they shall tend it, and shall camp around the tabernacle. 51 When the tabernacle is to set out, the Levites shall take it down; and when the tabernacle is to be pitched, the Levites shall set it up. And any outsider who comes near shall be put to death.