1 Samuel 21:10 - Coke's Commentary on the Holy Bible

And David—went to Achish, the king of Gath— David, being proscribed, but without reason, and being everywhere in danger in his own country, fled, as a man in perpetual hazard of his life, to the nearest place: but he fled to the inveterate enemies of his nation. The city he fled to was that of Goliath, whom he had slain, and whose sword he had now with him. Some of the most famous commanders of other nations have been forced to a similar conduct: witness Themistocles, Coriolanus, and others, who retreated to hostile nations, in order to escape the rage and fury of their own princes and countrymen. But in one thing he certainly appears to peculiar advantage, even above those great commanders; which is, that he went into exile without any hostile disposition or spirit of revenge towards his own country, which he affectionately loved, and substantially served, during his banishment from it.