Treasury of Scripture
Jephthah shows that the Israelites did not take the land of the Moabites or Ammonites, but that of the Amorites, which they had conquered from Sihon their king; and although the Amorites had taken the lands in question from the Ammonites, yet the title by which Israel held them was good, because they took them, not from the Ammonites, but from the Amorites.