Now we find why the prophet Gad (by divine direction, no doubt) ordered David to go into the land of Judah, Sa1 22:5. It was that, since Saul neglected the public safety, he might take care of it, notwithstanding the ill treatment that was given him; for he must render good for evil, and therein be a type of him who not only ventured his life, but laid down his life, for those that were his enemies.

I.Tidings are brought to David, as to the patron and protector of his country's liberties, that the Philistines had made a descent upon the city of Keilah and plundered the country thereabouts, Sa1 23:1. Probably it was the departure both of God and David from Saul that encouraged the Philistines to make this incursion. When princes begin to persecute God's people and ministers, let them expect no other than vexation on all sides. The way for any country to be quiet is to let God's church be quiet in it. If Saul fight against David, the Philistines shall fight against his country.

II.David is forward enough to come in for their relief, but is willing to enquire of the Lord concerning it. Here is an instance, 1. Of David's generosity and public-spiritedness. Though his head and hands were full of his own business, and he had enough to do, with the little force he had, to secure himself, yet he was concerned for the safety of his country and could not sit still to see that ravaged: nay, though Saul, whose business it was to guard the borders of his land, hated him and sought his life, yet he was willing, to the utmost of his power, to serve him and his interests against the common enemy, and bravely abhorred the thought of sacrificing the common welfare to his private revenge. Those are unlike to David who sullenly decline to do good because they have not been so well considered as they deserved for the services they have done. 2. Of David's piety and regard to God. He enquired of the Lord by the prophet Gad; for it should seem (by Sa1 23:6) that Abiathar came not to him with the ephod till he was in Keilah. His enquiry is, Shall I go and smite these Philistines? He enquires both concerning the duty (whether he might lawfully take Saul's work out of his hand, and act without a commission from him) and concerning the event, whether he might safely venture against such a force as the Philistines had with such a handful of men at his feet, and such a dangerous enemy as Saul was at his back. It is our duty, and will be our case and comfort, whatever happens, to acknowledge God in all our ways and to seek direction from him.

III.God appointed him once and again to go against the Philistines, and promised him success: Go, and smite the Philistines, Sa1 23:2. His men opposed it, Sa1 23:3. No sooner did he begin to have soldiers of his own than he found it hard enough to manage them. They objected that they had enemies enough among their own countrymen, they needed not to make the Philistines their enemies. Their hearts failed them when they only apprehended themselves in danger from Saul's band of pursuers, much more when they came to engage the Philistine-armies. To satisfy them, therefore, he enquired of the Lord again, and now received, not only a full commission, which would warrant him to fight though he had no orders from Saul (Arise, go down to Keilah), but also a full assurance of victory: I will deliver the Philistines into thy hand, Sa1 23:4. This was enough to animate the greatest coward he had in his regiment.

IV.He went accordingly against the Philistines, routed them, and rescued Keilah, (Sa1 23:5), and it should seem he made a sally into the country of the Philistines, for he carried off their cattle by way of reprisal for the wrong they did to the men of Keilah in robbing their threshing-floors. Here notice is taken (Sa1 23:6) that it was while David remained in Keilah, after he had cleared it of the Philistines, that Abiathar came to him with the ephod in his hand, that is, the high priest's ephod, in which the urim and thummin were. It was a great comfort to David, in his banishment, that when he could not go to the house of God he had some of the choicest treasures of that house brought to him, the high priest and his breast-plate of judgment.

Therefore David inquired of the Lord - In what way David made this inquiry we are not told, but it was probably by means of Abiathar; and therefore I think, with Houbigant that the sixth verse should be read immediately after the first. The adventure mentioned here was truly noble. Had not David loved his country, and been above all motives of private and personal revenge, he would have rejoiced in this invasion of Judah as producing a strong diversion in his favor, and embroiling his inveterate enemy. In most cases a man with David's wrongs would have joined with the enemies of his country, and avenged himself on the author of his adversities; but he thinks of nothing but succouring Keilah, and using his power and influence in behalf of his brethren! This is a rare instance of disinterested heroism.

The Lord said - Go and smite - He might now go with confidence, being assured of success. When God promises success, who need be afraid of the face of any enemy?

Therefore David inquired of the Lord, saying, shall I go and smite these Philistines?.... For though David was well disposed to serve his country, and was desirous of freeing them from their enemies the Philistines, he might have some doubts in his mind whether it would be right for him to engage with them now; partly because he could not act under a commission from his prince, Saul the king; and partly because he had such a small number of forces with him, that it might be hazardous for him to attack the armies of the Philistines with them, and attempt to raise the siege of Keilah; and therefore he thought it advisable, as doubtless it was, to inquire of the Lord what was his mind and will in this matter: how and by what means he inquired it is not said, very probably it was by the prophet Gad, who was with him, Sa1 22:5; for as for Abiathar, he was not yet come with the ephod, the Urim and Thummim, to inquire by them, Sa1 23:6; though some think that is observed there to show in what way David did inquire, namely, by Urim and Thummim; and so Kimchi and Abarbinel understand it; and it is supposed that he came to David when he was about Keilah, and near unto it, and so before he came thither, and time enough for him to inquire by him whether he should go thither or not:

and the Lord said unto David, go, and smite the Philistines, and save Keilah; which was not only giving him leave to go, and signifying it was his mind and will he should; but that he should be successful, and rout the Philistines, and raise the siege of Keilah, and save the city from falling into their hands.

David inquired of the Lord--most probably through Gad (Sa2 24:11; Ch1 21:9), who was present in David's camp (Sa1 22:5), probably by the recommendation of Samuel. To repel unprovoked assaults on unoffending people who were engaged in their harvest operations, was a humane and benevolent service. But it was doubtful how far it was David's duty to go against a public enemy without the royal commission; and on that account he asked, and obtained, the divine counsel. A demur on the part of his men led David to renew the consultation for their satisfaction; after which, being fully assured of his duty, he encountered the aggressors and, by a signal victory, delivered the people of Keilah from further molestation.