Romans 4:11-16

4:11 And he received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised, so that he would become the father of all those who believe but have never been circumcised, that they too could have righteousness credited to them. 4:12 And he is also the father of the circumcised, who are not only circumcised, but who also walk in the footsteps of the faith that our father Abraham possessed when he was still uncircumcised.

4:13 For the promise to Abraham or to his descendants that he would inherit the world was not fulfilled through the law, but through the righteousness that comes by faith. 4:14 For if they become heirs by the law, faith is empty and the promise is nullified. 4:15 For the law brings wrath, because where there is no law there is no transgression either. 4:16 For this reason it is by faith so that it may be by grace, with the result that the promise may be certain to all the descendants – not only to those who are under the law, but also to those who have the faith of Abraham, who is the father of us all

Galatians 4:22-31

4:22 For it is written that Abraham had two sons, one by the slave woman and the other by the free woman. 4:23 But one, the son by the slave woman, was born by natural descent, while the other, the son by the free woman, was born through the promise. 4:24 These things may be treated as an allegory, for these women represent two covenants. One is from Mount Sinai bearing children for slavery; this is Hagar. 4:25 Now Hagar represents Mount Sinai in Arabia and corresponds to the present Jerusalem, for she is in slavery with her children. 4:26 But the Jerusalem above is free, and she is our mother. 4:27 For it is written:

“Rejoice, O barren woman who does not bear children;

break forth and shout, you who have no birth pains,

because the children of the desolate woman are more numerous

than those of the woman who has a husband.”

4:28 But you, brothers and sisters, are children of the promise like Isaac. 4:29 But just as at that time the one born by natural descent persecuted the one born according to the Spirit, so it is now. 4:30 But what does the scripture say? “Throw out the slave woman and her son, for the son of the slave woman will not share the inheritance with the son” of the free woman. 4:31 Therefore, brothers and sisters, we are not children of the slave woman but of the free woman.