1 Samuel 26:8-12 NIV
Abishai said to David, “Today God has delivered your enemy into your hands. Now let me pin him to the ground with one thrust of the spear; I won’t strike him twice.”
But David said to Abishai, “Don’t destroy him! Who can lay a hand on the LORD’s anointed and be guiltless? As surely as the LORD lives,” he said, “the LORD himself will strike him, or his time will come and he will die, or he will go into battle and perish. But the LORD forbid that I should lay a hand on the LORD’s anointed. Now get the spear and water jug that are near his head, and let’s go.”
So David took the spear and water jug near Saul’s head, and they left. No one saw or knew about it, nor did anyone wake up. They were all sleeping, because the LORD had put them into a deep sleep.
NIV: New International Version