1st Samuel 26:10

7 So David and Abishai came down to the army by night: and Saul was sleeping inside the ring of carts with his spear planted in the earth by his head: and Abner and the people were sleeping round him.

8 Then Abishai said to David, God has given up your hater into your hands today; now let me give him one blow through to the earth with his spear, and there will be no need to give him a second.

9 And David said to Abishai Do not put him to death; for who, without sin, may put out his hand against the man on whom the Lord has put the holy oil?

10 And David said, By the living Lord, the Lord will send destruction on him; the natural day of his death will come, or he will go into the fight and come to his end.

11 Never will my hand be stretched out against the man marked with the holy oil; but take the spear which is by his head and the vessel of water, and let us go.

12 So David took the spear and the vessel of water from Saul's head; and they got away without any man seeing them, or being conscious of their coming, or awaking; for they were all sleeping because a deep sleep from the Lord had come on them.

13 Then David went over to the other side, and took his place on the top of a mountain some distance away, with a great space between them;