John Gills Exposition of the Bible Commentary - 2 Samuel 21:15
Moreover the Philistines had yet war again with Israel ,.... Besides what is before recorded in this and the preceding book; being animated to it partly by the number of giants among them, and partly by the decline of David's life, and it may be chiefly by the insurrections and rebellions in Israel; though some think that these battles were not after the rebellions of Absalom and Sheba, and the affair of the Gibeonites, though here recorded; but before, and quickly after the war with the... read more
Matthew Henry's Complete Commentary - 2 Samuel 21:15-22
We have here the story of some conflicts with the Philistines, which happened, as it should seem, in the latter end of David's reign. Though he had so subdued them that they could not bring any great numbers into the field, yet as long as they had any giants among them to be their champions, they would never be quiet, but took all occasions to disturb the peace of Israel, to challenge them, or make incursions upon them. I. David himself was engaged with one of the giants. The Philistines began... read more