1 Samuel 26:1-8

The Ziphites came to Saul at Gibeah, saying, “Is David not hiding on the hill of Hachilah, east of Jeshimon?” So Saul arose and went down to the Wilderness of Ziph, taking with him three thousand chosen men of Israel, to search for David [there] in the wilderness of Ziph. Saul camped on the hill of Hachilah, which is beside the road east of Jeshimon, but David stayed in the wilderness. When he saw that Saul came into the wilderness after him, David sent out spies, and he learned that Saul was definitely coming. So 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. Then 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.” So 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. Then Abishai said to David, “God has given your enemy into your hand this day; now then, please let me strike him with the spear driving it to the ground with one stroke, and I will not strike him the second time.”