4  And David assembled the ^achildren of Aaron, and the Levites:

  14  And he appointed, according to the order of David his father, the ^bcourses of the priests to their service, and the Levites to their charges, to praise and minister before the priests, as the duty of every day required: the porters also by their courses at every gate: for so had David the man of God commanded.

  2  And Hezekiah appointed the ^acourses of the priests and the Levites after their courses, every man according to his service, the priests and Levites for burnt offerings and for peace offerings, to minister, and to give thanks, and to praise in the gates of the tents of the Lord.

  4  And prepare yourselves by the houses of your fathers, after your courses, ^baccording to the writing of David king of Israel, and according to the writing of Solomon his son.

  18  And they set the priests in their divisions, and the Levites in their ^bcourses, for the service of God, which is at Jerusalem; as it is written in the book of Moses.