Numbers 7:7

5“Accept these from them, that they may be used in doing the service of the Tent of Meeting; and you shall give them to the Levites, to every man according to his service.”

6Moses took the wagons and the oxen, and gave them to the Levites.

7He gave two wagons and four oxen to the sons of Gershon, according to their service.

8He gave four wagons and eight oxen to the sons of Merari, according to their service, under the direction of Ithamar the son of Aaron the priest.

9But to the sons of Kohath he gave none, because the service of the sanctuary belonged to them; they carried it on their shoulders.