Romans 4:16 AMPC

[16] Therefore, [inheriting] the promise is the outcome of faith and depends [entirely] on faith, in order that it might be given as an act of grace (unmerited favor), to make it stable and valid and guaranteed to all his descendants-not only to the devotees and adherents of the Law, but also to those who share the faith of Abraham, who is [thus] the father of us all.