KJV: That the princes of Israel, heads of the house of their fathers, who were the princes of the tribes, and were over them that were numbered, offered:
NASB: Then the leaders of Israel, the heads of their fathers' households, made an offering (they were the leaders of the tribes; they were the ones who were over the numbered men).
KJV: And they brought their offering before the LORD, six covered wagons, and twelve oxen; a wagon for two of the princes, and for each one an ox: and they brought them before the tabernacle.
NASB: When they brought their offering before the LORD, six covered carts and twelve oxen, a cart for every two of the leaders and an ox for each one, then they presented them before the tabernacle.