Rivers often mark the edges of lands, but what happens when those edges are redrawn by conquest? This verse highlights how geographical and political boundaries aren't static, especially in God's unfolding plan.
A Contested Frontier
The Arnon River wasn't just a geographical feature; it was a significant border. At the time of Israel's journey, it marked the boundary between the Moabites and the Amorites.
- Moab's Territory: Historically, Moab possessed land north of the Arnon. However, by the time Israel arrived, the Amorites, under King Sihon, had conquered this territory.
- Amorite Dominion: Sihon had pushed the Moabites south of the Arnon, claiming the land north of the river for himself. This is why the text states the Arnon was between Moab and the Amorites – it was the new dividing line after the Amorite conquest.
This detail is crucial. It explains why God could permit Israel to take and occupy the land north of the Arnon. It was no longer Moabite land, but Amorite land that God was giving to Israel, thus not violating the command not to wage war against Moab (Deuteronomy 2:9).