Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
29:25constituit quoque Levitas in domo Domini cum cymbalis et psalteriis et citharis secundum dispositionem David et Gad videntis regis et Nathan prophetae siquidem Domini praeceptum fuit per manum prophetarum eius
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.