'Priests and Levites' in the Bible

and said unto all the congregation of Israel, "If it seem you good - and also to be of the LORD our God - Let us take and send unto the remnant of our brethren throughout all the land of Israel, and to the priests and Levites with them, in their cities and suburbs, and gather them together to us.

and of the companies of the priests and Levites that waited by course, and of all workmanship, that should serve for the house of the LORD, and for all vessels that should serve in the house of the LORD.

Behold the priests and Levites divided in companies, for to do all manner of service that pertaineth to the house of God; and beside that, thou hast with thee for all manner of workmanship, all that are willing and wise for any manner of service. And the lords and all the people are at thy commandment in all things."