Numbers 7:1-3

On the day Moses set up the Tabernacle, he anointed it and set it apart as holy. He also anointed and set apart all its furnishings and the altar with its utensils. Then the leaders of Israel—the tribal leaders who had registered the troops—came and brought their offerings. Together they brought six large wagons and twelve oxen. There was a wagon for every two leaders and an ox for each leader. They presented these to the LORD in front of the Tabernacle.