1 Samuel 24:8-10

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.

9And David said to Saul, Why dost thou listen to words of men, saying, Behold, David seeks thy hurt?

10Behold, this day thine eyes have seen how that Jehovah had given thee this day into my hand in the cave; and they bade me kill thee; but [mine eye] spared thee; and I said, I will not put forth my hand against my lord, for he is the anointed of Jehovah.