Numbers 7:2-6
2 Then the leaders of Israel, the heads of families who were the tribal leaders in charge of those who were counted, made offerings.
3 They 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.
4 The 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.”
6 So Moses took the carts and oxen and gave them to the Levites.