Numbers 3:2-4  Amplified Bible, Classic Edition

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 consecrated and ordained to minister in the priest’s office.

⁴ But 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 in the priest’s office in the presence and under the supervision of Aaron their father.^(A)