Numbers 3:3-4

These {are} the names of the sons of Aaron, the priests which were anointed, whom he consecrated to minister in the priest's office. {whom...: Heb. whose hand he filled} 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.