Numbers 7:4-9 - The Distribution Of The Gifts
4 And the LORD spake unto Moses, saying, 5 "Take it of them and let them be to do the service of the tabernacle of witness, and give them unto the Levites, every man according unto his office."
6 And Moses took the chariots and the oxen, and gave them unto the Levites: 7 two chariots and four oxen he gave unto the sons of Gershon according unto their office. 8 And four chariots and eight oxen he gave unto the sons of Merari according unto their offices, under the hands of Ithamar the son of Aaron the priest. 9 But unto the sons of Kohath he gave none, for the office that pertained to them was holy, and therefore they must bear upon shoulders.