2 Chronicles 8:14-15

In keeping with the ordinance of his father David, he appointed the divisions of the priests for their duties, and the Levites to lead the praise and to assist the priests according to each day’s requirement. He also appointed the gatekeepers by divisions for the various gates, because this was what David the man of God had ordered. They did not deviate from the king’s commands to the priests or to the Levites in any matter, including that of the treasuries.