Numbers 3:2-4

Darby Translation

² And these are the names of the sons of Aaron: Nadab the firstborn, and Abihu, Eleazar and Ithamar.

³ These are the names of the sons of Aaron, the anointed priests, who were consecrated to exercise the priesthood.

⁴ And Nadab and Abihu died before Jehovah when they offered strange fire before Jehovah in the wilderness of Sinai, and they had no sons; and Eleazar and Ithamar exercised the priesthood in the presence of Aaron their father.