Second Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
16:23consilium autem Ahitofel quod dabat in diebus illis quasi si quis consuleret Deum sic erat omne consilium Ahitofel et cum esset cum David et cum esset cum Absalom
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.