1 Samuel 24:8-10

8David also arose afterward, and went out of the cave, and cried after Saul, saying, My lord the king. And when Saul looked behind him, David stooped with his face to the earth, and bowed himself.

9And David said to Saul, Wherefore hearest thou men’s words, saying, Behold, David seeketh thy hurt? 10Behold, this day thine eyes have seen how that Yhwh had delivered thee to day into mine hand in the cave: and some bade me kill thee: but mine eye spared thee; and I said, I will not put forth mine hand against my lord; for he is Yhwh's anointed.