I Samuel 24:4-6

Then the men of David said to him, “This is the day of which the LORD said to you, ‘Behold, I will deliver your enemy into your hand, that you may do to him as it seems good to you.’ ” And David arose and secretly cut off a corner of Saul’s robe. Now it happened afterward that David’s heart troubled him because he had cut Saul’s robe. And he said to his men, “The LORD forbid that I should do this thing to my master, the LORD’s anointed, to stretch out my hand against him, seeing he is the anointed of the LORD.”