*Minor differences ignored. Grouped by changes, with first version listed as example.
The Philistines also came and spread themselves in the valley of Rephaim. Or "of the giants", as Joshua 15:8; which lay to the west of Jerusalem; of which; see Gill on Joshua 15:8; the Philistines spreading themselves in it, shows that they were very numerous.
valley of Rephaim--that is, "of giants," a broad and fertile plain, which descends gradually from the central mountains towards the northwest. It was the route by which they marched against Jerusalem. The "hold" to which David went down "was some fortified place where he might oppose the progress of the invaders," and where he signally defeated them.
*More commentary available at chapter level.