This was the order in which they carried out their assigned responsibilities when they entered the Lord’s temple, according to the regulations given them by their ancestor ¹  Aaron, just as the Lord God of Israel had instructed him. ² 

David and the army officers selected some of the sons of Asaph, Heman, and Jeduthun to prophesy as they played stringed instruments and cymbals. ¹  The following men were assigned this responsibility: ²