'Priests and Levites' in the Bible

And David said unto all the congregation of Israel, If it seems good unto you, and that it is of the LORD our God, let us send out unto our brethren everywhere, that are left in all the land of Israel, and with them also to the priests and Levites who are in their cities and pasture lands, that they may gather themselves unto us:

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

These likewise cast lots even as their brethren the sons of Aaron in the presence of David the king, and Zadok, and Ahimelech, and the heads of the fathers' houses of the priests and Levites; the principal fathers did even as their younger brethren.