Numbers 7:2-4

Young's Literal Translation

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.

⁴ And Jehovah speaketh unto Moses, saying,