Divrey Hayamim Alef 24:1-3

Orthodox Jewish Bible

24 Now these are the divisions of the Bnei Aharon; the Bnei Aharon; Nadav, and Avihu, Eleazar, and Itamar.

² But Nadav and Avihu died before avihem (their father), and had no banim; therefore Eleazar and Itamar became Kohanim.

³ And Dovid with both Tzadok of the Bnei Eleazar, and Achimelech of the Bnei Itamar, divided them according to their pekudim (offices, assignments) in their avodah.