In the sight of Aaron — Under his inspection and direction, and as their father's servants or ministers in the priest's office.
Related Commentaries of Numbers 3:4
Numbers 3:4
4 And Nadab and Abihu died before the LORD, when they offered strange fire before the LORD, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.