Komentarz do Rodzaju 15:20

ואת הרפאים AND THE REPHAIM — the land Og King of Bashan, of which it said, (Deuteronomy 3:13) “All that (Bashan) is called the land of the Rephaim”.

ואת החתי, the omission of the חוי may mean that that tribe was identical with the רפאים.

The Land of Og about which it is said ... It seems that Og, although he was actually an Emorite — as it is written about [Sichon and Og], “Two kings of the Emorites” (Devarim 3:8) — was king of the Chivites who are the Refa’im. And Og who was an Emorite, is called “remnant of the Refa’im” (ibid) because he was their king. But if you say “the Refa’im” means [the Land of] Og, and all of them were Emorites, then why does it say (v. 21), “the Emorites”? The Emorites were already accounted for by, “the Refa’im”. (Re’m)

ואת הרפאים, another word for the tribe known as Chivvi, mentioned as one of the seven Canaanite tribes.