1Ch 1 Chronicles, chapter First Book of Chronicles, chapter 25
Moreover David [beloved] and the captains of the host separated to the service of the sons of Asaf [gatherer], and of Heiman [faithful], and of Y’dutun [praising], who should prophesy with harps, with psalteries, and with cymbals: and the number of the workmen according to their service was:Num 4:23; 2Ch 5:12