Numbers 7:4-9 - The Distribution Of The Gifts
4 And the Lord said to Moses, 5 Take the things from them, to be used for the work of the Tent of meeting; and give them to the Levites, to every man what is needed for his work.
6 So Moses took the carts and the oxen and gave them to the Levites. 7 Two carts and four oxen he gave to the sons of Gershon for their work; 8 And four carts and eight oxen he gave to the sons of Merari for their work, under the direction of Ithamar, the son of Aaron the priest. 9 But to the sons of Kohath he gave nothing; because they had the care of the holy place, taking it about on their backs.