2 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
16:23And the counsel of Ahithophel, which he counselled in those days, was as if a man had enquired at the oracle of God: so was all the counsel of Ahithophel both with David and with Absalom.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.