Philistines: Allowed to Remain in Canaan

…the five rulers of the Philistines, all the Canaanites, the Sidonians, and the Hivites who lived in the mountains of Lebanon from Mount Baal-hermon to Lebo-hamath.

These nations were left to test the Israelites, to find out whether they would keep the commandments of the LORD, which He had given their fathers through Moses.