David also arose afterward, and went out of the cave, and cried after Saul, saying, My lord the king. When Saul looked behind him, David bowed with his face to the earth, and did obeisance.
"See, my father"  (1 Samuel 24:11).  On two counts, these words were appropriate in David's mouth.  The king was his father-in-law; and custom required that an inferior address the king in such language.