1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
24:8David also arose afterwards, and went out of the cave, and cried after Saul, saying, My lord the king! And when Saul looked behind him, David bowed with his face to the earth, and did obeisance.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.