1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
17:39And David girded his sword above his long robe, and beginneth to go, for he hath not tried it; and David saith unto Saul, `I am not able to go with these, for I had not tried;' and David turneth them aside from off him.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.