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;