1 Samuel 23:12 - Joseph Benson’s Commentary on the Old and New Testaments

The Lord said, They will deliver thee up God saw the base and cowardly disposition of the inhabitants of Keilah, who, though they had been so lately delivered by David, yet would have given him up, had he stayed among them, at the first appearance of Saul's army coming against them. “And here, methinks,” says Delaney, “is an event that will easily solve that hard question, about the consistency of the divine prescience with human free-will. A good politician, who was let into the course of Saul's secret practices with the men of Keilah, and had fair opportunities of sifting their dispositions upon the point, might fairly pronounce upon the event; how much more, then, that all-seeing God, who searcheth the secrets of the heart, and seeth the thoughts afar off seeth them in all their secret workings, tendencies, and temptations, and through all their mazes and masks.” To explain this a little further: the inhabitants of Keilah acted freely, just as their own hearts dictated to them; they were at liberty to behave faithfully to David, had he stayed among them, as well as to betray him. God did not, therefore, pronounce that they would deliver him up to Saul, because he had laid them under any absolute necessity of so doing; but because he saw Saul's secret designs, on the one hand, and the secret workings of their minds, and their tendency to fear and baseness, on the other. And, therefore, when David inquired of him, he pronounced, They will deliver thee up. If any person could have known as much of their hearts as God, he might have pronounced the same concerning them. It is, however, the property of God only to see the secrets of the heart. And as this power in him extends to every man that cometh into the world, as folly as it did to the people of Keilah, we may easily conceive how God foreknows all the changes of events in this world from the beginning to the end, though he leave the human mind to act of itself freely; and only by his superintending wisdom directs all, to bring about his gracious purposes, and to educe good from evil.