1 Chronicles 24:5-6

5Thus they were divided by lot, one group as another, for there were officials of the sanctuary and officials of the house of God, from the sons of Eleazar and from the sons of Ithamar.

6And the scribe, Shemaiah the son of Nethanel, one of the Levites, wrote them down before the king, the leaders, Zadok the priest, Ahimelech the son of Abiathar, and the heads of the fathers’ houses of the priests and Levites, one father’s house taken for Eleazar and one for Ithamar.