1 Chronicles 24:2-4

New King James Version

² And ^(A)Nadab and Abihu died before their father, and had no children; therefore Eleazar and Ithamar ministered as priests. ³ Then David with Zadok of the sons of Eleazar, and ^(B)Ahimelech of the sons of Ithamar, divided them according to the schedule of their service.

⁴ There were more leaders found of the sons of Eleazar than of the sons of Ithamar, and thus they were divided. Among the sons of Eleazar were sixteen heads of their fathers’ houses, and eight heads of their fathers’ houses among the sons of Ithamar.