1. Aaron's descendants were then divided into work groups. Aaron had four sons: Nadab, Abihu, Eleazar, and Ithamar.
2. But Nadab and Abihu died long before their father, without having any sons. That's why Eleazar and Ithamar served as priests.
3. David divided Aaron's descendants into groups, according to their assigned work. Zadok, one of Eleazar's descendants, and Ahimelech, one of Ithamar's descendants, helped David.
4. Eleazar's descendants were divided into sixteen groups, and Ithamar's were divided into eight groups, because Eleazar's family included more family leaders.