Numbers 7:4-9

Then the LORD spoke to Moses, saying, “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.” So Moses took the carts and the oxen, and gave them to the Levites. Two carts and four oxen he gave to the sons of Gershon, according to their service; and 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. But to the sons of Kohath he gave none, because theirs was the service of the holy things, which they carried on their shoulders.