en_tn/gen/15/04.md

Then, behold, the word of Yahweh came to him

The word "behold" emphasizes the fact that the word of Yahweh came to Abraham again, as in Genesis 15:1. This could be translated as "Then, the word of Yahweh came to him again."

This man will not be your heir

The phrase "This man" refers to Eliezer of Damascus. It can also be translated as "Your servant will not be your heir."

the one that will come from your own body

This can be translated as "the one that you will father" or "your very own son." Abram's own son would become his heir.

number the stars

"count the stars"

So will your descendants be

Just as Abram would not be able to count all the stars, he would not be able to count all his descendants because there would be so many.