1 Samuel 26:8-12

8Then said Abishai to David, God hath delivered up thine enemy into thine 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.

9And David said to Abishai, Destroy him not: for who can put forth his hand against the LORD’S anointed, and be guiltless?

10And David said, As the LORD liveth, the LORD shall smite him; or his day shall come to die; or he shall go down into battle, and perish.

11The LORD forbid that I should put forth mine hand against the LORD’S anointed: but now take, I pray thee, the spear that is at his head, and the cruse of water, and let us go.

12So 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 the LORD was fallen upon them.