But David said to Abishai, “Do not kill him, for who can put out his hand against the Lord’s anointed [king] and be guiltless (innocent)?” David also said, “As the Lord lives, most certainly the Lord will strike him [in His own time and way], or his day will come and he will die, or he will go down into battle and be carried off [dead]. The Lord forbid that I would put out my hand against the Lord’s anointed; but now take the spear that is by his head and the jug of water, and let us go.” – 1 Samuel 26:9-11
This was a bold enterprise, for two men to go into a camp of three thousand men, though it was in the night; when though they might suppose the greater part of them were asleep, yet they could not well suppose this of all, and especially of the guards or sentinels; but no doubt David was moved to this, not merely by the dint of his natural courage, but by the Spirit of God, by whom he might be assured of protection, and that Saul and the people were cast into a deep sleep by the Lord, as they were, and this the Lord moved him to, that he might have an opportunity a second time to convince Saul of his innocence, and that he had no design upon his life:
David realizes the divine protection of his life by the LORD. David had not harmed Saul, because of his spiritual conviction. David asks the LORD for even more divine protection, because of his spiritual convictions. David places his safety in the hands of the LORD. It is the LORD who is the Deliverer of us all.
David is showing grace here. He is honouring Saul and not anticipating that honour to be returned. He seems entirely set on his God to show him honour and favour, to deliver him. Despite the turn of events that gave David the perfect opportunity to take Saul’s life, he was sensitive enough to the Spirit of God, intent enough on honouring the Lord above all else and seeking to be faithful regardless of shifting circumstances, that he was not swayed in his resolve.