1 Chronicles 24:1-5

1Now these were the divisions of the sons of Aaron. The sons of Aaron were Nadab and Abihu, Eleazar and Ithamar.

2But Nadab and Abihu died before their father and had no children, so Eleazar and Ithamar served as kohanim.

3David, with Zadok of the sons of Eleazar and Ahimelech of the sons of Ithamar, divided them into their offices according to their avodah.

4More leading men were found among the sons of Eleazar than among the sons of Ithamar, so they divided them: the sons of Eleazar had 16 leaders of clans and the sons of Ithamar had eight leaders of clans.

5Thus, they were impartially divided by lot for there were officials of the Holy Place and officials of God, both from the sons of Eleazar and from the sons of Ithamar.