'Priests and Levites' in the Bible

And David said to all the congregation of Israel, If it seemeth good to you, and that it is of the LORD our God, let us send abroad to our brethren every where, that are left in all the land of Israel, and with them also to the priests and Levites who are in their cities and suburbs, that they may assemble to us:

And Shemaiah the son of Nethaneel the scribe, one of the Levites, wrote them before the king, and the princes, and Zadok the priest, and Ahimelech the son of Abiathar, and before the chief of the fathers of the priests and Levites: one principal household being taken for Eleazar, and one taken for Ithamar.

These likewise cast lots over against their brethren the sons of Aaron in the presence of David the king, and Zadok, and Ahimelech, and the chief of the fathers of the priests and Levites, even the principal fathers over against their younger brethren.