Genesis 36:20-21
20-30. Sons of Seir, the Horite—native dukes, who were incorporated with those of the Edomite race.
Deuteronomy 2:12
8-18. we passed . . . through the way of the plain—the Arabah or great valley, from Elath ("trees") (the Ailah of the Greeks and Romans). The site of it is marked by extensive mounds of rubbish.
Ezion-geber—now Akaba, both were within the territory of Edom; and after making a circuit of its southeastern boundary, the Israelites reached the border of Moab on the southeast of the Salt Sea. They had been forbidden by divine command to molest the Moabites in any way; and this special honor was conferred on that people not on their own account, for they were very wicked, but in virtue of their descent from Lot. (See on De 23:3). Their territory comprised the fine country on the south, and partly on the north of the Arnon. They had won it by their arms from the original inhabitants, the Emims, a race, terrible, as their name imports, for physical power and stature (Ge 14:5), in like manner as the Edomites had obtained their settlement by the overthrow of the original occupiers of Seir, the Horims (Ge 14:6), who were troglodytes, or dwellers in caves. Moses alluded to these circumstances to encourage his countrymen to believe that God would much more enable them to expel the wicked and accursed Canaanites. At that time, however, the Moabites, having lost the greater part of their possessions through the usurpations of Sihon, were reduced to the small but fertile region between the Zered and the Arnon.Deuteronomy 2:22
19-37. when thou comest nigh over against the children of Ammon, distress them not, nor meddle with them—The Ammonites, being kindred to the Moabites, were, from regard to the memory of their common ancestor, to remain undisturbed by the Israelites. The territory of this people had been directly north from that of Moab. It extended as far as the Jabbok, having been taken by them from a number of small Canaanitish tribes, namely, the Zamzummins, a bullying, presumptuous band of giants, as their name indicates; and the Avims, the aborigines of the district extending from Hazerim or Hazeroth (El Hudhera) even unto Azzah (Gaza), but of which they had been dispossessed by the Caphtorim (Philistines), who came out of Caphtor (Lower Egypt) and settled in the western coast of Palestine. The limits of the Ammonites were now compressed; but they still possessed the mountainous region beyond the Jabbok (Jos 11:2). What a strange insight does this parenthesis of four verses give into the early history of Palestine! How many successive wars of conquest had swept over its early state—what changes of dynasty among the Canaanitish tribes had taken place long prior to the transactions recorded in this history!