Numbers 1:51-53

51 When men shall go forth, or be removed, the deacons shall take down the tabernacle; when the tents shall be set, they shall set it up. Whoever of strangers nigheth, he shall be slain.

52 Soothly the sons of Israel shall set tents, each man by his companies, and his fellowships, and his host;

53 forsooth the deacons shall set their tents by compass of the tabernacle, lest indignation be made on the multitude of the sons of Israel; and they shall wake [or watch] in the keepings of the tabernacle of witnessing.