The placement of this genealogy is deliberate. The chapter does not end with Abraham and Isaac descending together, nor with their return to Beer-sheba. It ends with a list of names. The Torah reports that Abraham received news of his brother Nahor’s household — twelve children by two women, Milcah and Reumah. The twelfth child of Milcah is Bethuel. Bethuel is the father of Rebekah.
The reader is being prepared. Isaac is not yet married. Sarah will die in the next chapter. Before the narrative turns to grief, the Torah plants the seed of the next generation’s covenant marriage. The family line that will produce Rebekah is here established, before the reader even knows a Rebekah will be needed.
This is one of the Torah’s characteristic techniques: the answer arrives before the question is fully asked. The covenant must continue through Isaac. The line that will carry it is already named. The genealogy is not administrative detail — it is providence announced in the form of a list.
