Numbers 3:3-5

King James Version

³ These are the names of the sons of Aaron, the priests which were anointed, whom he consecrated to minister in the priest's office.

⁴ And 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: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.

⁵ And the Lord spake unto Moses, saying,