Numbers 7:1-3

Now it came to pass, when Moses had finished setting up the tabernacle, that he anointed it and consecrated it and all its furnishings, and the altar and all its utensils; so he anointed them and consecrated them. Then the leaders of Israel, the heads of their fathers’ houses, who were the leaders of the tribes and over those who were numbered, made an offering. And 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.