1. The divisions of the Aaronites:Aaron’s family: Nadab, Abihu, Eleazar, and Ithamar.
2. Nadab and Abihu died before their father did, without having sons, and so Eleazar and Ithamar served as priests.
3. David, with the help of Zadok from Eleazar’s family and Ahimelech from Ithamar’s family, divided them according to their appointed duties.