Numbers 3:3
3 These are the names of the sons of Aaron, ethe anointed priests, fwhom he ordained to serve as priests.
Numbers 3:4
4 gBut Nadab and Abihu died before the Lord when they offered unauthorized fire before the Lord in the wilderness of Sinai, and they had no children. So Eleazar and Ithamar served as priests in the lifetime of Aaron their father.