5 Then David set out and came to the place where Saul had set up camp and saw for himself where Saul and Abner, son of Ner, his general, were staying. Saul was safely inside the camp, encircled by the army.

6 Taking charge, David spoke to Ahimelech the Hittite and to Abishai son of Zeruiah, Joab's brother: "Who will go down with me and enter Saul's camp?" Abishai whispered, "I'll go with you." 7 So David and Abishai entered the encampment by night, and there he was - Saul, stretched out asleep at the center of the camp, his spear stuck in the ground near his head, with Abner and the troops sound asleep on all sides. 8 Abishai said, "This is the moment! God has put your enemy in your grasp. Let me nail him to the ground with his spear. One hit will do it, believe me; I won't need a second!" 9 But David said to Abishai, "Don't you dare hurt him! Who could lay a hand on God's anointed and even think of getting away with it?" 10 He went on, "As God lives, either God will strike him, or his time will come and he'll die in bed, or he'll fall in battle, 11 but God forbid that I should lay a finger on God's anointed. Now, grab the spear at his head and the water jug and let's get out of here." 12 David took the spear and water jug that were right beside Saul's head, and they slipped away. Not a soul saw. Not a soul knew. No one woke up! They all slept through the whole thing. A blanket of deep sleep from God had fallen on them.

Matthew Henry's Commentary on 1 Samuel 26:5-12

Commentary on 1 Samuel 26:1-12

(Read 1 Samuel 26:1-12)

How soon do unholy hearts lose the good impressions convictions have made upon them! How helpless were Saul and all his men! All as though disarmed and chained, yet nothing is done to them; they are only asleep. How easily can God weaken the strongest, befool the wisest, and baffle the most watchful! David still resolved to wait till God thought fit to avenge him on Saul. He will by no means force his way to the promised crown by any wrong methods. The temptation was very strong; but if he yielded, he would sin against God, therefore he resisted the temptation, and trusted God with the event.