1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
25:1And David and the heads of the host separate for service, of the sons of Asaph, and Heman, and Jeduthun, who are prophesying with harps, with psalteries, and with cymbals, and the number of the workmen is according to their service.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.