1 Tawarikh 15:12

15:12 He told them: “You are the leaders of the Levites’ families. You and your relatives must consecrate yourselves and bring the ark of the Lord God of Israel up to the place I have prepared for it.

1 Tawarikh 24:4

24:4 The descendants of Eleazar had more leaders than the descendants of Ithamar, so they divided them up accordingly; the descendants of Eleazar had sixteen leaders, while the descendants of Ithamar had eight. ¹ 

1 Tawarikh 24:31

24:31 Just like their relatives, the descendants of Aaron, they also cast lots before King David, Zadok, Ahimelech, the leaders of families, the priests, and the Levites. The families of the oldest son cast lots along with the those of the youngest. ² 

[24:4]  ¹ tn Heb “And the sons of Eleazar were found to be more, with respect to the heads of men, than the sons of Ithamar, and they divided them. To the sons of Eleazar there were sixteen heads, according to the house of the fathers; and to the sons of Ithamar there were eight, according to the house of their fathers.”

[24:31]  ² tn Heb “the fathers [i.e., families] of the head [i.e., oldest] just like his youngest brother.”