John Gill Commentary 1 Samuel 24:12

"Jehovah judge between me and thee, and Jehovah avenge me of thee; but my hand shall not be upon thee." — 1 Samuel 24:12 (ASV)

The Lord judge between me and you And make it appear who is in the right, and who is in the wrong: and the Lord avenge me of you; if he continued thus to persecute him: but my hand shall not be upon you; to kill you, though it may be in my power again to do it, as it has been; but this I am determined upon, let me suffer what I will, I will not lay hands on you to do you any hurt, but leave you with God to requite all the evil done to me by you.