1 Chronicles 24:1-3

1Aaron's descendants, the priests, were in the following groups. Aaron's four sons were: Nadab, Abihu, Eleazar and Ithamar.

2But Nadab and Abihu died before their father died. They had no sons. So Eleazar and Ithamar served God as priests.

3Zadok and Ahimelech helped David to put Aaron's descendants into groups. Zadok was a descendant of Eleazar. Ahimelech was a descendant of Ithamar. They told each group what their work would be to serve God.