I Chronicles 24:3, 31

Then David with Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar, divided them according to the schedule of their service.

These also cast lots just as their brothers the sons of Aaron did, in the presence of King David, Zadok, Ahimelech, and the heads of the fathers’ houses of the priests and Levites. The chief fathers did just as their younger brethren.