1 Samuel 26:6-9

6And David asked Ahimelech the Hittite and Abishai son of Zeruiah, Joab’s brother, “Who will go down with me to Saul in the camp?”

“I will go with you,” answered Abishai.

7That night David and Abishai came to the troops, and Saul was lying there asleep in the inner circle of the camp, with his spear stuck in the ground by his head. And Abner and the troops were lying around him.

8Abishai said to David, “Today God has delivered your enemy into your hand. Now, therefore, please let me thrust the spear through him into the ground with one stroke. I will not need to strike him twice!”

9But David said to Abishai, “Do not destroy him, for who can extend a hand against the LORD’s anointed and be guiltless?”