Deuteronómio 3:11 Comentario: Rashi, Chizkuni, Ramban & Ibn Ezra

מיתר הרפאים [ONLY OG … REMAINED] OF THE REST OF THE REPHAIM whom Amraphel and his allies slew in Ashteroth-Karnaim (Genesis 14:5), and he (Og) escaped from the battle, as it is said, (Genesis 14:13) "And the fugitive came", and that was Og (Genesis Rabbah 42:8; cf. Rashi on Genesis 14.13.1).

הנה ערשו ערש ברזל, “behold, his bedstead was a bedstead made of iron.” This need not be understood literally; it means that the materials used in constructing the city walls were as sturdy as if they had been made out of strong metal. (B’chor shor) The word ערש occurs in Amos 3,12 as meaning: the leg of a bed.

FOR ONLY OG KING OF BASHAN REMAINED OF THE REMNANT OF THE REPHAIM; BEHOLD, HIS BEDSTEAD WAS A BEDSTEAD OF IRON etc. The purport of the verse is to tell that this Og was called the king of the Amorites because he ruled over them, but he himself was of the Rephaim. And in order to tell of his height and strength, since the Rephaim were a people great, and many, and tall as the Anakim,²⁶⁷Above, 2:10. it states that his bedstead was a bedstead of iron, no bedstead of wood being able to support him as it does other people. It is in the city of Rabbah which was his dwelling place, and when the children of Ammon destroyed the Rephaim as is mentioned above,²⁶⁸Ibid., Verse 21. and his city [Og’s capital, Ashtaroth] was captured, he alone was saved from the hands of the Ammonites. It is this which is stated, For only Og king of Bashan remained of the remnant of the Rephaim. His bed was left there in Rabbah which now belongs to the children of Ammon, and the Ammonites preserved it as testimony that they destroyed a great and tall people; and the mighty man whose height was like the height of the cedars, and he was strong as the oaks²⁶⁹Amos 2:9. — from him they captured his kingdom. This is the sense of the word behold [behold, his bedstead …], meaning: “behold, the proof of [Og’s strength] still exists; it is the iron bedstead, very long and wide, and is to be found in Rabbah of the children of Ammon,” since his bedstead, which was in Ashtaroth, was plundered and lost.²⁷⁰That is, when the Ammonites destroyed the Rephaim and captured Og’s capital city Ashtaroth (above, 1:4) they plundered it and took his bedstead from there and brought it to Rabbah.