Bamidbar 7:1-3

Orthodox Jewish Bible

7 And it came to pass on the day that Moshe had fully set up the Mishkan, and had anointed it, and set it apart as kodesh, and all the instruments thereof, both the Mizbe’ach and all the vessels thereof, and had anointed them, and set them apart as kodesh,

² That the Nasiim (Rulers) of Yisroel, heads of the Bais of their Avot, who were the Nasiim of the tribes, and were over them that were numbered, offered;

³ And they brought their korban before Hashem, six covered carts, and twelve oxen; a cart for two of the Nasiim, and for each one an ox; and they brought them before the Mishkan.