And they brought. — That is, Aaron and his sons, according to the command of Moses, and the elders on behalf of the people, and according to the order of Aaron, who was directed by Moses so to do, brought the aforenamed sacrifices.
And all the congregation... — That is, the elders who represented the people, whom Moses summoned (see Leviticus 9:1), and as many of the people as could find room assembled before the sanctuary in the court-yard to witness the newly-installed priests officiating for the first time.