“These are the names of the sons of Aaron, the priests which were anointed, whom he consecrated to minister in the priest's office.”
King James Version (KJV)
3:1 These - Which follow in this chapter. The generations - The kindred or family. Moses his family and children are here included under the general name of the Amramites, #Nu 3:27|, which includes all the children and grand - children of Amram, the persons only of Aaron and Moses being excepted. And the generations of Moses are thus obscurely mentioned, because they were but common Levites, the priesthood being given solely to Aaron's posterity, whence Aaron is here put before Moses, who elsewhere is commonly named after him. In Sinai - Nadab and Abihu, were then alive, though dead at the time of taking this account.
3:4 In the sight of Aaron - Under his inspection and direction, and as their father's servants or ministers in the priest's office.