1 Samuel 26:5-7

5Then David got up and went to the place where Saul had camped. David detected the spot where Saul lay asleep, as well as Abner son of Ner his army commander. Saul was lying inside the barricade and the troops were camped around him.

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.