Numbers 3:2-4

Amplified Bible

² These are the names of the sons of Aaron: Nadab the firstborn, Abihu, Eleazar, and Ithamar. ³ These are the names of the sons of Aaron, the priests who were anointed, whom Aaron ^[a]consecrated and ordained to minister in the priest’s office. ⁴ But Nadab and Abihu died in the presence of the Lord when they offered strange (unholy, unacceptable, inappropriate) fire before the Lord in the Wilderness of Sinai; and they had no sons. So Eleazar and Ithamar served as priests ^[b]in the presence and under the supervision of Aaron their father.^(A)