It was in Crash Course World History. It is at 1 minute and 53 second. Here it goes:
Your descendants will number the stars, and you can have the land of Canaan forever.
I have checked all the meanings of the verb, but still I cannot get it. I guess the speaker meant by that that the descendants will amount to the number of stars, but I am not sure because in all the examples given by the online dictionaries, there must be some number after the verb number. For example:
After the hurricane the homeless numbered over 200,000.
Is it possible that the presenter meant outnumber the stars?