1These were the divisions of the descendants of Aaron. The sons of Aaron were Nadab, Abihu, Eleazar, and Ithamar.
2But Nadab and Abihu died before their father did, and they had no sons; so Eleazar and Ithamar served as priests.
3With the help of Eleazar’s descendant Zadok and Ithamar’s descendant Ahimelech, David divided them according to the offices of their service.
— 1 Chronicles 24:1-3