Numbers 3:1-4

ASV(i) 1 Now these are the generations of Aaron and Moses in the day that Jehovah spake with Moses in mount Sinai. 2 And these are the names of the sons of Aaron: Nadab the first-born, and Abihu, Eleazar, and Ithamar. 3 These are the names of the sons of Aaron, the priests that were anointed, whom he consecrated to minister in the priest's office. 4 And Nadab and Abihu died before Jehovah, when they offered strange fire before Jehovah, in the wilderness of Sinai, and they had no children; and Eleazar and Ithamar ministered in the priest's office in the presence of Aaron their father.