1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
29:8And David saith unto Achish, `But what have I done? and what hast thou found in thy servant from the day that I have been before thee till this day -- that I go not in and have fought against the enemies of my lord the king?'
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.