# For of the remnant ... the way people measure

This is background information about King Og. 

# Rephaim

See how you translated this in Deuteronomy 2:11.

# Look!

"Pay attention to the important thing I am going to tell you."

# Was it not in Rabbah, ... live?

Possible meanings are 1) "It was in Rabbah, ... live." or 2) "It is in Rabbah ... live.". The writer uses a question to remind the people of Israel that they could go to Rabbah and see how large Og must have been.  

# cubits

A cubit is 46 centimeters. 

# the way people measure

"according to the cubit most people use"