New Defender's Study Bible Notes
51:9 Rahab. God’s power was greatly manifest in the “ancient days,” especially in the days of Noah and Moses, and perhaps even more so when Satan, that old “dragon” was cast out of heaven. The name “Rahab” is enigmatic. It does not refer to the harlot of Jericho (Joshua 2) but to a great enemy of God (see also Psalm 87:4; 89:10). “Rahab” means “boaster” and could well be—in this context, at least—a name for “the dragon.” However, many scholars assume it refers to Egypt.