Exodus 24:5
And he sent young men of the children of Israel, which offered burnt offerings, and sacrificed peace offerings of oxen unto the LORD.
And he sent young men of the children Israel,.... To the altar under the hill he had these young men, according to Jarchi, were the firstborn of the children of Israel; and so the Targums Onkelos and Jonathan; and the latter adds,
"for unto this hour the worship was among the firstborn, as yet the tabernacle of the covenant was not made, and as yet the priesthood was not given to Aaron.''
But though this is a notion that has obtained among learned men, both Jews and Christians, it has been called in question by some, who have such reasons against it, as are not easily refuted. And very probably, as the seventy elders were such as were selected from the senior and graver part of the people, so these were choice young men, that were separated from others for this service, without any regard to birthright:
which offered burnt offerings, and sacrificed peace offerings of oxen unto the LORD; by way of thankfulness; and such were used at making covenants, when the parties ate and drank together. The Vulgate Latin version has it, "twelve calves", without any authority for it.