1 Chronicles 24:1-3
The Divisions of the Priests
1 The divisions of the descendants of Aaron were as follows: Aaron’s sons were Nadab, Abihu, Eleazar, and Ithamar.(A)
2 But Nadab and Abihu died before their father, and they had no sons, so Eleazar and Ithamar served as priests.(B)
3 Together with Zadok(C) from the sons of Eleazar and Ahimelech from the sons of Ithamar, David divided them according to the assigned duties of their service.