1st Chronicles Chapter 24 Bible in Basic English
And there were more chiefs among the sons of Eleazar than among the sons of Ithamar; and this is how they were grouped: of the sons of Eleazar there were sixteen, all heads of families; and of the sons of Ithamar, heads of families, there were eight.
So they were put into groups, by the Lord's decision, one with another; for there were rulers of the holy place and rulers of the house of God among the sons of Eleazar and the sons of Ithamar.
And Shemaiah, the son of Nethanel the scribe, who was a Levite, put down their names in writing, the king being present with the rulers, and Zadok the priest, and Ahimelech, the son of Abiathar, and the heads of families of the priests and the Levites; one family being taken for Eleazar and then one for Ithamar, and so on.
So they were put into their different groups, to take their places in the house of the Lord, in agreement with the rules made by Aaron their father, as the Lord, the God of Israel, had given him orders.
Selection was made of these in the same way as of their brothers the sons of Aaron, David the king being present, with Zadok, and Ahimelech, and the heads of families of the priests and of the Levites; the families of the chief in the same way as those of his younger brother.