2 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
29:25And he set the Levites in the house of Jehovah with cymbals, with lutes, and with harps, according to the commandment of David, and of Gad the king's seer, and of Nathan the prophet; for the commandment was of Jehovah through his prophets.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.