1 Chronicles 24:19 These were their offices for their ministry when they came in to the house of the LORD according to the ordinance given to them through Aaron their father, just as the LORD God of Israel had commanded him.

2 Chronicles 8:14 Now according to the ordinance of his father David, he appointed the divisions of the priests for their service, and the Levites for their duties of praise and ministering before the priests according to the daily rule, and the gatekeepers by their divisions at every gate; for David the man of God had so commanded.

2 Chronicles 31:2 And Hezekiah appointed the divisions of the priests and the Levites by their divisions, each according to his service, both the priests and the Levites, for burnt offerings and for peace offerings, to minister and to give thanks and to praise in the gates of the camp of the LORD. (NASB ©1995)