'Descendants' in the Bible
For the promise to Abraham or to his descendants, [that] he would be heir of the world, [was] not through the law, but through the righteousness by faith.
Because of this, [it is] by faith, in order that [it may be] according to grace, so that the promise may be secure to all the descendants, not only to those of the law, but also to those of the faith of Abraham, who is the father of us all
who against hope believed in hope, so that he became the father of many nations, according to what was said, "so will your descendants be."
nor [are they] all children because they are descendants of Abraham, but "In Isaac will your descendants be named."
That is, [it is] not the children {by human descent} [who are] children of God, but the children of the promise are counted as descendants.
And just as Isaiah foretold, "If the Lord of hosts had not left us descendants, we would have become like Sodom and would have resembled Gomorrah."
Therefore I say, God has not rejected his people, has he? May it never be! For I also am an Israelite, from the descendants of Abraham, of the tribe of Benjamin.