And it came to pass in those days, that the Philistines gathered their armies together for warfare, to fight with Israel. And Achish said unto David, Know thou assuredly, that thou shalt go out with me to battle, thou and thy men.

And it came to pass in those days, that the Philistines gathered together their armies to be prepared for war against Israel: and Achis said to David: Know thou now assuredly, that thou shalt go out with me to the war, thou, and thy men.

And it came to pass in those days that the Philistines gathered together their armies for warfare to fight against Israel. And Achish said to David, Know thou assuredly that thou shalt go out with me to the camp, thou and thy men.

And it came to pass in those days, that the Philistines collected their armies for warfare, to fight with Israel. And Achish said to David, Know thou assuredly, that thou shalt go out with me to battle, thou and thy men.

And it cometh to pass in those days, that the Philistines gather their camps for the war, to fight against Israel, and Achish saith unto David, 'Thou dost certainly know that with me thou dost go out into the camp, thou and thy men.'

Now in those days the Philistines got their forces together to make war on Israel. And Achish said to David, Certainly you and your men are to go out with me to the fight.

Now it happened that, in those days, the Philistines gathered together their troops, so that they might be prepared for war against Israel. And Achish said to David, "I know now, certainly, that you will go out with me to war, you and your men."

The Philistines gathered their armies together - Sir Isaac Newton conjectures that the Philistines had got a great increase to their armies by vast numbers of men which Amasis had driven out of Egypt. This, with Samuel's death, and David's disgrace, were no inconsiderable motives to a new war, front which the Philistines had now every thing to hope.
Thou shalt go out with me to battle - This he said, being deceived by what David had told him.

And it came to pass in those days, that the Philistines gathered their armies together for warfare, to fight with Israel. And Achish said unto David, (a) Know thou assuredly, that thou shalt go out with me to battle, thou and thy men.
(a) Though it was a great grief to David to fight against the people of God, yet such was his infirmity, he did not dare deny him.

And it came to pass in those days,.... That David was in the country of the Philistines:
that the Philistines gathered their armies together: out of their five principalities or lordships:
for warfare to fight with Israel; with whom they were continually at war, and though sometimes there was a cessation of arms, yet never any settled peace; and the Philistines took every opportunity and advantage against them, as they now did; when David was among them, and so had nothing to fear from him, but rather expected his assistance; and Samuel was dead, and Saul in a frenzy:
and Achish said unto David: who seems to have been at the head of the combined armies of the Philistines:
know thou assuredly that thou shall go with me to battle, thou and thy men; against Israel; which was a trying thing to David, and whereby he was like to be drawn into a dilemma; either to fight against his country, which he could not do conscientiously; or be guilty of ingratitude to Achish, and incur his displeasure, and be liable to be turned out of his country, or treated in a worse manner, even he and his men, to be seized on and cut to pieces by the forces of the Philistines, should he refuse.

David could not refuse Achish without danger. If he promised assistance, and then stood neuter, or went over to the Israelites, he would behave with ingratitude and treachery. If he fought against Israel, he would sin greatly. It seemed impossible that he should get out of this difficulty with a clear conscience; but his evasive answer, intended to gain time, was not consistent with the character of an Israelite indeed. Troubles are terrors to the children of disobedience. In his distress, Saul inquired of the Lord. He did not seek in faith, but with a double, unstable mind. Saul had put the law in force against those that had familiar spirits, Exodus 22:18. Many seem zealous against, sin, when they are any way hurt by it, who have no concern for the glory of God, nor any dislike of sin as sin. Many seem enemies to sin in others, while they indulge it in themselves. Saul will drive the devil out of his kingdom, yet harbours him in his heart by envy and malice. How foolish to consult those whom, according to God's law, he had endeavoured to root out!

ACHISH'S CONFIDENCE IN DAVID. (1-Samuel 28:1-6)
The Philistines gathered their armies together for warfare, to fight with Israel--The death of Samuel, the general dissatisfaction with Saul, and the absence of David, instigated the cupidity of those restless enemies of Israel.
Achish said to David, Know thou assuredly, that thou shalt go out with me to battle--This was evidently to try him. Achish, however, seems to have thought he had gained the confidence of David and had a claim on his services.

"In those days," i.e., whilst David was living in the land of the Philistines, it came to pass that the Philistines gathered their armies together for a campaign against Israel. And Achish sent word to David that he was to go with him in his army along with his men; and David answered (1-Samuel 28:2), "Thereby (on this occasion) thou shalt learn what thy servant will do." This reply was ambiguous. The words "what thy servant will do" contained no distinct promise of faithful assistance in the war with the Israelites, as the expression "thy servant" is only the ordinary periphrasis for "I" in conversation with a superior. And there is just as little ground for inferring from 1-Samuel 29:8 that David was disposed to help the Philistines against Saul and the Israelites; for, as Calovius has observed, even there he gives no such promise, but "merely asks for information, that he may discover the king's intentions and feelings concerning him: he simply protests that he has done nothing to prevent his placing confidence in him, or to cause him to shut him out of the battle." Judging from his previous acts, it would necessarily have been against his conscience to fight against his own people. Nevertheless, in the situation in which he was placed he did not venture to give a distinct refusal to the summons of the king. He therefore gave an ambiguous answer, in the hope that God would show him a way out of this conflict between his inmost conviction and his duty to obey the Philistian king. He had no doubt prayed earnestly for this in his heart. And the faithful God helped His servant: first of all by the fact that Achish accepted his indefinite declaration as a promise of unconditional fidelity, as his answer "so (לכן, itaque, i.e., that being the case, if thy conduct answers to thy promise) "I will make thee the keeper of my head" (i.e., of my person) implies; and still more fully by the fact that the princes of the Philistines overturned the decision of their king (1-Samuel 29:3.).