1 Samuel 24:4-6

ISV(i) 4 David’s men told him, “Look, today is the day about which the LORD spoke to you when he said, ‘I’ll give your enemy into your hand.’ Do to him whatever you want!”
David rose and stealthily cut off the corner of Saul’s robe. 5 Afterwards, David’s conscience bothered him because he had cut off the corner of Saul’s robe. 6 He told his men, “God forbid that I should do this thing to your majesty, the LORD’s anointed, by stretching out my hand against him, since he’s the LORD’s anointed.”