1 Chronicles 24:1-3

Darby Translation

24 And the divisions of the sons of Aaron: the sons of Aaron, Nadab and Abihu, Eleazar and Ithamar.

² And Nadab and Abihu died before their father, and had no children; and Eleazar and Ithamar exercised the priesthood.

³ And David distributed them, both Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar, according to their office in their service.