Numbers 7:1-3

Young's Literal Translation

7 And it cometh to pass on the day of Moses' finishing setting up the tabernacle, that he anointeth it, and sanctifieth it, and all its vessels, and the altar, and all its vessels, and he anointeth them, and sanctifieth them,

² and the princes of Israel (heads of the house of their fathers, they [are] princes of the tribes, they who are standing over those numbered) bring near,

³ yea, they bring their offering before Jehovah, six waggons covered, and twelve oxen -- a waggon for two of the princes, and an ox for one -- and they bring them near before the tabernacle.