Those are of faith are blessed

Just as Abraham "BELIEVED GOD, AND IT WAS ACCOUNTED TO HIM FOR RIGHTEOUSNESS." Therefore know that only those who are of faith are sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, "In you all the nations shall be blessed." (Gal 3:6-8)

The law came 430 years after God's covenant and promise to Abraham. The covenant had already been made by God. So the law does not do away with the promise. (Gal 3:17) So then those who are of faith are blessed with believing Abraham. (Gal 3:9) Hear Him!