Numbers 3:25-26

3:25 And the responsibilities of the Gershonites in the tent of meeting included the tabernacle, the tent with its covering, the curtain at the entrance of the tent of meeting, 3:26 the hangings of the courtyard, the curtain at the entrance to the courtyard that surrounded the tabernacle and the altar, and their ropes, plus all the service connected with these things.

Numbers 7:5-7

7:5 “Receive these gifts from them, that they may be used in doing the work of the tent of meeting; and you must give them to the Levites, to every man as his service requires.”

7:6 So Moses accepted the carts and the oxen and gave them to the Levites. 7:7 He gave two carts and four oxen to the Gershonites, as their service required;