^2 (A)Nadab and Abihu died before their father did, and left no descendants, so their brothers Eleazar and Ithamar became priests. ³ King David organized the descendants of Aaron into groups according to their duties. He was assisted in this by Zadok, a descendant of Eleazar, and by Ahimelech, a descendant of Ithamar. ⁴ The descendants of Eleazar were organized into sixteen groups, while the descendants of Ithamar were organized into eight; this was done because there were more male heads of families among the descendants of Eleazar.