Treasury of Scripture Knowledge
Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,
By his grace they are justified freely through the redemption that is in the Messiah Jesus,
Therefore, since we have been justified by faith, we have peace with God through our Lord Jesus the Messiah.
You see, then, that those who have faith are Abraham's real descendants.
even when we were dead because of our offenses, made us alive together with the Messiah (by grace you have been saved),
And so, made heirs by his own grace, eternal life we now embrace.
For when God made his promise to Abraham, he swore an oath by himself, since he had no one greater to swear by.
2 Peter 1:10
So then, my brothers, be all the more eager to make your calling and election certain, for if you keep on doing this you will never fail.
Afterward he received the mark of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised. Therefore, he is the ancestor of all who believe while uncircumcised, in order that righteousness may be credited to them.
That is, it is not merely the children born through natural descent who were regarded as God's children, but it is the children born through the promise who were regarded as descendants.
Look to Abraham your father, and to Sarah who gave you birth. For when he was only one person I called him, but I made him fruitful and made him many.
I'll make your descendants as plentiful as the specks of dust of the earth, so that if one could count the specks of dust of the earth, then your descendants could also be counted.
Jesus answered him, "What is written in the Law? What do you read there?"
Therefore, those who believe are blessed together with Abraham, the one who believed.
So you, brothers, are children of the promise, like Isaac.