Numbers 4:32-33

4:32 and the posts of the surrounding courtyard with their sockets, tent pegs, and ropes, along with all their furnishings and everything for their service. You are to assign by names the items that each man is responsible to carry. 4:33 This is the service of the families of the Merarites, their entire service concerning the tent of meeting, under the authority of Ithamar son of Aaron the priest.”

Numbers 7:8

7:8 and he gave four carts and eight oxen to the Merarites, as their service required, under the authority of Ithamar son of Aaron the priest.

Numbers 18:21

18:21 See, I have given the Levites all the tithes in Israel for an inheritance, for their service which they perform – the service of the tent of meeting.

Numbers 4:26-27

4:26 the hangings for the courtyard, the curtain for the entrance of the gate of the court, which is around the tabernacle and the altar, and their ropes, along with all the furnishings for their service and everything that is made for them. So they are to serve.

4:27 “All the service of the Gershonites, whether carrying loads or for any of their work, will be at the direction of Aaron and his sons. You will assign them all their tasks as their responsibility.

Numbers 8:22

8:22 After this, the Levites went in to do their work in the tent of meeting before Aaron and before his sons. As the Lord had commanded Moses concerning the Levites, so they did.