1 Samuel 26:5-7

5So David arose and went to the place where Saul had camped, and saw the spot where Saul lay, as well as Abner the son of Ner, the commander of his army; and Saul was lying inside the circle of the camp, with the army camped around him.

6Then David said to Ahimelech the Hittite and to Abishai the son of Zeruiah, brother of Joab, “Who will go down with me to Saul in the camp?” And Abishai said, “I will go down with you.”

7So David and Abishai went to the army during the night, and there was Saul lying asleep inside the circle of the camp with his spear stuck in the ground by his head; and Abner and the people were lying around him.