2Ch 2 Chronicles2 Tawarikh, chapterpasal Second Book of Chronicles2 Tawarikh, chapterpasal 8

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