Numbers 3:2-4

Thomson(i) 2 these were the names of Aaron's sons, Nadab his first born, and Abiud, Eleazar and Ithamar. 3 These were the names of Aaron's sons who were anointed priests, whose hands were consecrated to minister in the priest's office. 4 But Nadab and Abiud died in the presence of the Lord, upon their offering strange fire before the Lord, in the wilderness of Sina, and they had no children; so Eleazar and Ithamar officiated as priests with their father.