Numbers 3:36

3:36 The appointed responsibilities of the Merarites included the frames of the tabernacle, its crossbars, its posts, its sockets, its utensils, plus all the service connected with these things,

Numbers 4:28

4:28 This is the service of the families of the Gershonites concerning the tent of meeting. Their responsibilities will be under the authority of Ithamar son of Aaron the priest.

Numbers 18:4

18:4 They must join with you, and they will be responsible for the care of the tent of meeting, for all the service of the tent, but no unauthorized person may approach you.