C. F. Keil and Franz Delitzsch on Deuteronomy 2:8-10

Deu 2:8-10

In accordance with this divine command, they went past the Edomites by the side of their mountains, “from the way of the Arabah, from Elath (see at Gen 14:6) and Eziongeber” (see at Num 33:35), sc., into the steppes of Moab, where they were encamped at that time.

God commanded them to behave in the same manner towards the Moabites, when they approached their frontier (Deu 2:9). They were not to touch their land, because the Lord had given Ar to the descendants of Lot for a possession. In Deu 2:9 the Moabites are mentioned, and in Deu 2:19 the Amorites also. The Moabites are designated as “sons of Lot,” for the same reason for which the Edomites are called “brethren of Israel” in Deu 2:4. The Israelites were to uphold the bond of blood-relationship with these tribes in the most sacred manner. Ar, the capital of Moabitis (see at Num 21:15), is used here for the land itself, which was named after the capital, and governed by it.