Numbers 7:3-9

3They brought as their gifts before the Lord six covered carts and twelve oxen—an ox from each leader and a cart from every two. These they presented before the tabernacle. 4The Lord said to Moses, 5“Accept these from them, that they may be used in the work at the tent of meeting. Give them to the Levites as each man’s work requires.” 6So Moses took the carts and oxen and gave them to the Levites. 7He gave two carts and four oxen to the Gershonites, as their work required, 8and he gave four carts and eight oxen to the Merarites, as their work required. They were all under the direction of Ithamar son of Aaron, the priest. 9But Moses did not give any to the Kohathites, because they were to carry on their shoulders the holy things, for which they were responsible.