Romans 4:9 KJV
Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness.
I was struck by those words of the Apostle, "for we say…" What is to follow is his fundamental argument. It is the basis of everything he preaches about Christ. "For we say" is an assertion but, also something Paul treats as a point already conceded.
Abraham was reckoned righteous before God by faith and before circumcision.
The point Paul was arguing is that therefore both Jew and Gentile can be of the righteous family of Abraham because it comes not of heritage or of ceremony; the children of righteousness are born into that family by faith.