3:1-13 There was much work belonging to the priests' office, and there were now only Aaron and his two sons to do it; God appoints the Levites to attend them. Those whom God finds work for, he will find help for. The Levites were taken instead of the first-born. When He that made us, saves us, as the first-born of Israel were saved, we are laid under further obligations to serve him faithfully. God's right to us by redemption, confirms the right he has to us by creation.And these are the names of the sons of Aaron,.... The Targum of Jonathan adds, disciples of Moses, the master of the Israelites; none of the posterity of Moses being expressly, named; Jarchi observes, that the sons of Aaron are called the generations of Moses, because he taught them the law; for whoever, he says, teaches his neighbour's son, the law, the Scripture accounts of him as if he begat him, see 1 Corinthians 4:15,

Nadab the firstborn, and Abihu, Eleazar and Ithamar; as in Exodus 6:23.