1 Samuel 26:8-10

8Abishai said to David, “Today God has delivered your enemy into your hands. Now let me drive the spear right through him into the ground with one swift jab! A second jab won’t be necessary!”

9But David said to Abishai, “Don’t kill him! Who can extend his hand against the Lord’s chosen one and remain guiltless?”

10David went on to say, “As the Lord lives, the Lord himself will strike him down. Either his day will come and he will die, or he will go down into battle and be swept away.