Numbers 7:3-9

3And they brought their offering before the Lord, six covered carts and twelve oxen, a cart for every two of the leaders, and for each one an ox; and they presented them before the tabernacle.

4Then the Lord spoke to Moses, saying,

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

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

7Two carts and four oxen he gave to the sons of Gershon, according to their service;

8and four carts and eight oxen he gave to the sons of Merari, according to their service, under the authority of Ithamar the son of Aaron the priest.

9But to the sons of Kohath he gave none, because theirs was the service of the holy things, which they carried on their shoulders.