And they set the priests in their divisions, and the Levites in their divisions, for the service of God, which is at Jerusalem; as it is written in the book of Moses.
Moreover David and the captains of the army separated for the service some of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with lyres, and with cymbals: and the number of the workmen according to their service was:
And the priests stood at their posts: the Levites also with instruments of music of the LORD, which David the king had made to praise the LORD, because his mercy endures forever, whenever David offered praise by their ministry; and the priests sounded trumpets opposite them, and all Israel stood.