'Descendants' in the Bible

so that the promise should be made sure to all Abraham's true descendants; not merely to those who are righteous through the Law, but to those who are righteous through a faith like that of Abraham. Thus in the sight of God in whom he believed, who gives life to the dead and makes reference to things that do not exist, as though they did, Abraham is the forefather of all of us. As it is written, "I have appointed you to be the forefather of many nations."

Even as Isaiah says in an earlier place, "Were it not that the Lord, the God of Hosts, had left us some few descendants, we should have become like Sodom, and have come to resemble Gomorrah."

while the descendants of Israel, who were in pursuit of a Law that could give righteousness, have not arrived at one.

I ask, however, "Have they stumbled so as to be finally ruined?" No, indeed; but by their lapse salvation has come to the Gentiles in order to arouse the jealousy of the descendants of Israel;