1 Samuel 24:6-13

He said to his men, “The LORD forbid that I should do this to my lord the king. I shouldn’t attack the LORD’s anointed one, for the LORD himself has chosen him.” So David restrained his men and did not let them kill Saul. After Saul had left the cave and gone on his way, David came out and shouted after him, “My lord the king!” And when Saul looked around, David bowed low before him. Then he shouted to Saul, “Why do you listen to the people who say I am trying to harm you? This very day you can see with your own eyes it isn’t true. For the LORD placed you at my mercy back there in the cave. Some of my men told me to kill you, but I spared you. For I said, ‘I will never harm the king—he is the LORD’s anointed one.’ Look, my father, at what I have in my hand. It is a piece of the hem of your robe! I cut it off, but I didn’t kill you. This proves that I am not trying to harm you and that I have not sinned against you, even though you have been hunting for me to kill me. “May the LORD judge between us. Perhaps the LORD will punish you for what you are trying to do to me, but I will never harm you. As that old proverb says, ‘From evil people come evil deeds.’ So you can be sure I will never harm you.