I Samuel 28:1

"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 (Sa1 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 Sa1 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 prom…

Here is, I. The design of the Philistines against Israel. They resolved to fight them, Sa1 28:1. If the Israelites had not forsaken God, there would have been no Philistines remaining to molest them; if Saul had not forsaken him, they would by this time have been put out of all danger by them. The Philistines took an opportunity to make this attempt when they had David among them, whom they feared more than Saul and all his forces. II. The expectation Achish had of assistance from David in this war, and the encouragement David gave him to expect it: "Thou shalt go with me to battle," says Achish. "If I protect thee, I may demand service from thee;" and he will think himself happy if he may have such a man as David on his side, who prospered whithersoever he went. David gave him an ambiguous answer: "We will see what will be done; it will be time enough to talk of that hereafter; but surely thou shalt know what thy servant can do" (Sa1 28:2), that is, "I will consider in what post I may be best able to serve thee, if thou wilt but give me leave to choose it." Thus he keeps himself free from a promise to serve him and yet keeps up his expectation of it; for Achish took it in no other sense than as an engagement to assist him, and promised him, thereupon, that he would make him captain of the guards, protector, or prime-minister of state. III. The drawing of the armies, on both sides, into the field (Sa1 28:4): The Philistines pitched in Shunem, which was in the tribe of Issachar, a great way north from their country. The land of Israel, it seems, was ill-guarded, when the Philistines could march their army into the very heart of the country. Saul, while he pursued David, left his people naked and exposed. On some of the adjacent mountains of Gilboa Saul mustered his force…

28:1 another war: Hostilities between Israel and the Philistines were now routine. In exchange for providing refuge, Achish expected David’s military involvement and cooperation.