Final answer:
According to Jewish belief, if Abraham obeys, all the families of the earth will be blessed as part of the divine promise of the Abrahamic covenant.
Step-by-step explanation:
If Abraham obeys, according to the religious texts and beliefs of Judaism, all the families of the earth will be blessed. In the context of the biblical narrative, the idea of Abraham's obedience leading to blessings for all families is deeply rooted in the Abrahamic covenant, a key aspect of Jewish belief. The divine promise was that in exchange for Abraham's devotion, his descendants would become a great nation, and through them, all nations on earth would be blessed.