First Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
25:1igitur David et magistratus exercitus secreverunt in ministerium filios Asaph et Heman et Idithun qui prophetarent in citharis et psalteriis et cymbalis secundum numerum suum dedicato sibi officio servientes
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.