1 Chronicles 24:2-4

New Century Version

² But Nadab and Abihu died before their father did, and they had no sons. So Eleazar and Ithamar served as the priests. ³ David, with the help of Zadok, a descendant of Eleazar, and Ahimelech, a descendant of Ithamar, separated their family groups into two different groups. Each group had certain duties. ⁴ There were more leaders from Eleazar’s family than from Ithamar’s—sixteen leaders from Eleazar’s family and eight leaders from Ithamar’s family.