Numbers 3:3-5

Young's Literal Translation

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.

⁵ And Jehovah speaketh unto Moses, saying,