Deuteronomy 2:12

The Horims also dwelt in Seir before time,.... Which is the name of a mount, and so of the country, from it; so called from Seir the Horite, who dwelt in it before it was possessed by Esau and his sons; but who the Horim or Horites were, from whence they had their name, is difficult to say; they were as early as the times of Chedorlaomer, Genesis 14:6. They seem to be so called from their dwelling in holes and caves in rocks, which the southern part of Edom or Idumea was full of, and to be the same the Greeks call Troglodytae:

but the children of Esau succeeded them; Esau and his sons marrying among them, made way for getting the country into their possession, as appears from Genesis 36:2 and in which they afterwards settled themselves by the dint of sword, since it follows:

when they had destroyed them from before them, and dwelt in their stead; even in Seir where they had dwelt, afterwards called Edom, from one of the names of Esau, Genesis 36:8

as Israel did in the land of his possession, which the Lord gave unto them; because this is said before the Canaanites were drove out of their land, and it was possessed by the Israelites, some think this was written by Ezra, or some other hand; but there is no need to suppose that; Moses, by a spirit of prophecy, and in faith of the promises and prophecies of God relating to this affair, which were just now about to be fulfilled, might write this; besides, it may refer to what was already done to the kingdoms of Sihon and Og, kings of the Amorites; which had been taken from them, and given to the tribes of Reuben and Gad, and the half tribe of Manasseh; and the above instances as well as this may be observed, to encourage the people of Israel that they should succeed in dispossessing the Canaanites, and settling in their land, in like manner as dispossessions of this kind had already been made.