Second Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
16:21et ait Ahitofel ad Absalom ingredere ad concubinas patris tui quas dimisit ad custodiendam domum ut cum audierit omnis Israhel quod foedaveris patrem tuum roborentur manus eorum tecum
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.