Kehillah in Rome 4:16

16 For this reason the havtachah (promise) is of emunah (faith), in order that it might be in accordance with unmerited Chen v’Chesed Hashem, that the havtachah might be certain to all the zera (seed), not to him who is of the Torah only, but also to bnei emunat Avraham (the sons of the faith of Avraham Avinu, to those who are of the faith of Abraham). Avraham Avinu is the father of us all,