1 Samuel 26:8-12

Then said Abishai to David, God hath delivered up thine enemy into thy hand this day: now therefore let me smite him, I pray thee, with the spear to the earth at one stroke, and I will not smite him the second time. And David said to Abishai, Destroy him not; for who can put forth his hand against Jehovah’s anointed, and be guiltless? And David said, As Jehovah liveth, Jehovah will smite him; or his day shall come to die; or he shall go down into battle and perish. Jehovah forbid that I should put forth my hand against Jehovah’s anointed: but now take, I pray thee, the spear that is at his head, and the cruse of water, and let us go. So David took the spear and the cruse of water from Saul’s head; and they gat them away: and no man saw it, nor knew it, neither did any awake; for they were all asleep, because a deep sleep from Jehovah was fallen upon them.