1. The divisions of Aaron’s descendants were as follows: Aaron’s sons were Nadab and Abihu, Eleazar and Ithamar.
2. Nadab and Abihu died before their father died, and neither had any children. So Eleazar and Ithamar served as priests.
3. David, Eleazar’s descendant Zadok, and Ithamar’s descendant Ahimelech divided Aaron’s descendants into groups for service.