Numbers 1:49-51

King James Version

⁴⁹ Only thou shalt not number the tribe of Levi, neither take the sum of them among the children of Israel:

⁵⁰ But thou shalt appoint the Levites over the tabernacle of testimony, and over all the vessels thereof, and over all things that belong to it: they shall bear the tabernacle, and all the vessels thereof; and they shall minister unto it, and shall encamp round about the tabernacle.

⁵¹ And when the tabernacle setteth forward, the Levites shall take it down: and when the tabernacle is to be pitched, the Levites shall set it up: and the stranger that cometh nigh shall be put to death.