Numbers 21:13

13 From thence they have journeyed, and encamp beyond Arnon, which [is] in the wilderness which is coming out of the border of the Amorite, for Arnon [is] the border of Moab, between Moab and the Amorite;

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 And they journey from Oboth, and encamp in Ije-Abarim, in the wilderness that [is] on the front of Moab, at the rising of the sun.

12 From thence they have journeyed, and encamp in the valley of Zared.

13 From thence they have journeyed, and encamp beyond Arnon, which [is] in the wilderness which is coming out of the border of the Amorite, for Arnon [is] the border of Moab, between Moab and the Amorite;

14 therefore it is said in a book, `The wars of Jehovah,' -- `Waheb in Suphah, And the brooks of Arnon;

15 And the spring of the brooks, Which turned aside to the dwelling of Ar, And hath leaned to the border of Moab.'