1 Chronicles 24:5-6

5They divided them by lots, for there were officials of the holy place and officials designated by God among the descendants of both Eleazar and Ithamar.

6The scribe Shemaiah son of Nethanel, a Levite, wrote down their names before the king, the officials, Zadok the priest, Ahimelech son of Abiathar, and the leaders of the priestly and Levite families. One family was drawn by lot from Eleazar, and then the next from Ithamar.