3:4 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. So Eleazar and Ithamar ministered as priests in the presence of Aaron their father.
Numbers 3:32
3:32 Now the head of all the Levitical leaders was Eleazar son of Aaron the priest. He was appointed over those who were responsible for the sanctuary.