2 Chronicles 35:10; 2 Chronicles 35:15

10 So the service was prepared, and the priests stood at their stations and the Levites by their divisions according to the king's command.

15 The singers, the sons of Asaph, were also at their stations according to the command of David, Asaph, Heman, and Jeduthun the king's seer; and the gatekeepers at each gate did not have to depart from their service, because the Levites their brethren prepared for them.