Numbers 7:1-5

And it came to pass on the day that Moses had made an end of setting up the tabernacle, and had anointed it and sanctified it, and all the furniture thereof, and the altar and all the vessels thereof, and had anointed them and sanctified them; that the princes of Israel, the heads of their fathers’ houses, offered. These were the princes of the tribes, these are they that were over them that were numbered: and they brought their oblation before Jehovah, six covered wagons, and twelve oxen; a wagon for every two of the princes, and for each one an ox: and they presented them before the tabernacle. And Jehovah spake unto Moses, saying, Take it of them, that they may be used in doing the service of the tent of meeting; and thou shalt give them unto the Levites, to every man according to his service.