2 Chronicles 35:15-16

15And the singers, the sons of Asaph, were in their places, according to the command of David, Asaph, Heman, and Jeduthun the king’s seer. Also the gatekeepers were at each gate; they did not have to leave their position, because their brethren the Levites prepared portions for them.

16So all the service of the Lord was prepared the same day, to keep the Passover and to offer burnt offerings on the altar of the Lord, according to the command of King Josiah.