1 Samuel 24:10, 18

Behold, this day thine eyes have seen how that Jehovah had delivered thee to-day into my hand in the cave: and some 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 Jehovah’s anointed.

And thou hast declared this day how that thou hast dealt well with me, forasmuch as when Jehovah had delivered me up into thy hand, thou killedst me not.