What does the Torah mean when it describes Og as "mi'Yeser ha'Refa'im"?
Ramban: Although he was king of the Emori, he was originally from the Refa'im, who were giants.
Seforno: Refer to 3:11:1:1. Even though many of the Refa'im escaped from the battle with the four kings, they were all killed when Amon conquered their land - and it was from that battle that only Og survived. 3
Targum Yonasan: It means that Og was the sole survivor of the Refa'im, all of whom perished in the Flood.
What is the translation of "Arso"?
Rashi: It means 'his bed'.
Rashbam: It means 'his cot'.
Hadar Zekenim, Rosh: It means his fortress.
Why does the Torah see fit to tell us that Og's 'Eres' was made of iron?
Ramban and Rashbam: Even in his infancy, he was very strong, and his cradle needed to be made of iron, since he would have broken a regular wooden bed. 1
Based on Hadar Zekenim, Rosh: The wall of his fortress (four Amos thick of iron) was impregnable.
Riva: The Torah teaches about his strength, to teach the Gevurah of Moshe (who killed him). 2
Rashbam: In spite of the fact that it was only a baby's cradle!
Why does the word "ha'Lo" conclude with a 'Hey' instead of with an 'Alef'?
Ba'al ha'Turim #2: Now the word has two 'Hey's, whose combined Gematriya is ten, This hints at Moshe, who was ten Amos tall, his weapon was ten Amos, who jumped ten Amos and who struck Og on his ankle (B'rachos 54b), which was ten Amos.
What is the significance of the fact that "Og's bed was in Rabat B'nei Amon"?
Ramban: When Amon defeated the Refa'im, 1 and only Og escaped, the B'nei Amon kept his bed intact in Rabat as testimony that they had defeated such a mighty nation.
Rashbam:. They left Og's cot 2 there - where he grew up - as testimony of his immense size even as a baby.
What are the connotations of "b'Amas Ish"?
Ramban: It means in the Amos of the tallest [normal] man. 3
The distance from the elbow to the end of the middle finger.
Ramban: It is as if it said 'be'Amas ha'Ish.' This is like "ha'Keves Echad" (Bamidbar 28:4) and "ba'Laylah Hu" (Bereishis 19:33)." According to this explanation, we are left with no idea of the actual size of his bed. Also, since a person's height [until his shoulder; some say, until his head] is normally three times his Amah. If so, he was a freak whose body was disproportionate to his arm (EC). However, if S'tam Cana'anim were even thirty Amos tall, it would not be noteworthy that Og's cradle was nine regular Amos. "Ka'Chagavim