1 Samuel 26:7-16

So David and Abishai came to the people by night, and behold, Saul lay sleeping inside the circle of the camp with his spear stuck in the ground at his head; and Abner and the people were lying around him. Then Abishai said to David, “Today God has handed your enemy over to you; now then, please let me pin him with the spear to the ground with one thrust, and I will not do it to him a second time.” But David said to Abishai, “Do not kill him, for who can reach out with his hand against the LORD’S anointed and remain innocent?” David also said, “As the LORD lives, the LORD certainly will strike him, or his day will come that he dies, or he will go down in battle and perish. The LORD forbid that I would reach out with my hand against the LORD’S anointed! But now please take the spear that is at his head and the jug of water, and let’s go.” So David took the spear and the jug of water that were at Saul’s head, and they left; and no one saw or knew about it, nor did anyone awaken, for they were all asleep, because a deep sleep from the LORD had fallen on them. Then David crossed over to the other side and stood on top of the mountain at a distance with a large area between them. And David called to the people and to Abner the son of Ner, saying, “Will you not answer, Abner?” Then Abner replied, “Who are you who calls to the king?” So David said to Abner, “Are you not a man? And who is like you in Israel? Why then have you not guarded your lord the king? For one of the people came to kill the king your lord! This thing that you have done is not good. As the LORD lives, all of you undoubtedly must die, because you did not guard your lord, the LORD’S anointed. And now, see where the king’s spear is and the jug of water that was at his head!”