John Gills Exposition of the Bible Commentary - 2 Samuel 21:17
But Abishai the son of Zeruiah succoured him ,.... Observing him in danger, made haste to his relief: and smote the Philistine, and killed him ; it seems as if Abishai engaged with the Philistine, and killed him; but inasmuch as it will bear to be interpreted of David, and since the four giants here and hereafter mentioned are said to fall by the hand of David and his servants, 2 Samuel 21:22 , it may be thought that this man fell by his hand; seeing it is clear that all the rest fell... 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