Numbers 7:6-8

LITV^{(i) 6} And Moses took the wagons and the oxen and gave them to the Levites. ⁷ He gave two wagons and four oxen to the sons of Gershon, according to their service. ⁸ And he gave four wagons and eight oxen to the sons of Merari, according to their service under Ithamar, the son of Aaron the priest.