'Descendants Of Abraham' in the Bible

So it is conditioned on faith, that it might be in accordance with God's unmerited favor, so that the promise might be in force for all the descendants of Abraham, not only for those who belong to the law party but also for those who belong to the faith group of Abraham. He is the father of us all,

nor [are they] all children because they are descendants of Abraham, but "In Isaac will your descendants be named."

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.