1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
29:29And the matters of David the king, the first and the last, lo, they are written beside the matters of Samuel the seer, and beside the matters of Nathan the prophet, and beside the matters of Gad the seer,
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.