ROM 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,