1 Samuel 26:6-9

6Then David spoke and asked Ahimelech the Hittite and Joab’s brother Abishai son of Zeruiah, saying, “Who will go down with me to Saul in the camp?” “I will go down with you,” Abishai answered.

7So David and Abishai approached the troops by night. Behold, Saul was lying asleep within the barricade with his spear stuck in the ground at his head, and Abner and the troops were sleeping around him.

8Then Abishai said to David, “God has delivered your enemy into your hand today. Now let me pin him to the ground with a single thrust of the spear. I will not have to strike him twice.”

9But David said to Abishai, “Don’t destroy him! For who can lay his hand on Adonai’s anointed and be guiltless?”