1 Tawarikh 24:2-3

24:2 Nadab and Abihu died before their father did; they had no sons. Eleazar and Ithamar served as priests.

24:3 David, Zadok (a descendant of Eleazar), and Ahimelech (a descendant of Ithamar) divided them into groups to carry out their assigned responsibilities. ¹ 

[24:3]  ¹ tn Heb “for their assignment in their service.”