5 Then David rose and came to the place where Saul had encamped. And David saw the place where Saul lay, with Abner the son of Ner, the commander of his army. Saul was lying within the encampment, while the army was encamped around him.

6 Then David said to Ahimelech the Hittite, and to Joab's brother Abishai the son of Zeruiah, "Who will go down with me into the camp to Saul?" And Abishai said, "I will go down with you." 7 So David and Abishai went to the army by night. And there lay Saul sleeping within the encampment, with his spear stuck in the ground at his head, and Abner and the army lay around him. 8 Then said Abishai to David, "God has given your enemy into your hand this day. Now please let me pin him to the earth with one stroke of the spear, and I will not strike him twice." 9 But David said to Abishai, "Do not destroy him, for who can put out his hand against the Lord's anointed and be guiltless?" 10 And David said, "As the Lord lives, the Lord will strike him, or his day will come to die, or he will go down into battle and perish. 11 The Lord forbid that I should put out my hand against the Lord's anointed. But take now the spear that is at his head and the jar of water, and let us go." 12 So David took the spear and the jar of water from Saul's head, and they went away. No man saw it or knew it, nor did any awake, for they were all asleep, because a deep sleep from the Lord had fallen upon 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.