Numbers 21:13

13 They started out from there and camped by the Arnon River. It's in the desert that spreads out into the territory of the Amorites. The Arnon is the border of Moab. It's between Moab and the Amorites.

Numbers 21:13 Meaning and Commentary

Numbers 21:13

From thence they removed, and pitched on the other side of
Arnon
A river on the borders of Moab:

which is in the wilderness that cometh out of the coasts of the
Amorites;
according to Jarchi, they went round the land of Moab, all to the south and east, and came not into the border of Moab, as Jephthah said, ( Judges 11:18 ) but before they came hither they had a station at Almondiblathaim, ( Numbers 33:46 Numbers 33:47 )

for Arnon is the border of Moab, between Moab and the Amorites;
a river which divided these two countries, and bounded them; and Moses is the more particular in this account, to show that the Israelites took nothing from the Moabites, but what the Amorites had taken from them, they being charged not to distress the Moabites and Ammonites, ( Deuteronomy 2:9 Deuteronomy 2:19 ) , see Jephthah's defence, ( Judges 11:15-27 ) .

Numbers 21:13 In-Context

11 Then they started out from Oboth. They camped in Iye Abarim. It's in the desert on the eastern border of Moab.

12 From there they moved on. They camped in the Zered Valley.

13 They started out from there and camped by the Arnon River. It's in the desert that spreads out into the territory of the Amorites. The Arnon is the border of Moab. It's between Moab and the Amorites.

14 Here is what the Book of the Wars of the LORD says about it. It says, "Sing about Waheb in Suphah and the valleys. Sing about the Arnon

15 and the slopes of the valleys. They lead to the place called Ar. They lie along the border of Moab."