1 Chronicles 24:5-6

All tasks were assigned to the various groups by means of sacred lots so that no preference would be shown, for there were many qualified officials serving God in the sanctuary from among the descendants of both Eleazar and Ithamar. Shemaiah son of Nethanel, a Levite, acted as secretary and wrote down the names and assignments in the presence of the king, the officials, Zadok the priest, Ahimelech son of Abiathar, and the family leaders of the priests and Levites. The descendants of Eleazar and Ithamar took turns casting lots.