Numbers 3:2-4

Young's Literal Translation

² And these [are] the names of the sons of Aaron: the first-born Nadab, and Abihu, Eleazar, and Ithamar;

³ these [are] the names of the sons of Aaron, the anointed priests, whose hand he hath consecrated for acting as priest.

⁴ And Nadab dieth -- Abihu also -- before Jehovah, in their bringing near strange fire before Jehovah, in the wilderness of Sinai, and sons they had not; and Eleazar -- Ithamar also -- acteth as priest in the presence of Aaron their father.