Understand that in the same way that Abraham believed God and it was credited to him as righteousness,
References for Galatians 3:6
those who believe are the children of Abraham.
But when it saw ahead of time that God would make the Gentiles righteous on the basis of faith, scripture preached the gospel in advance to Abraham: All the Gentiles will be blessed in you.
References for Galatians 3:8
Therefore, those who believe are blessed together with Abraham who believed.
All those who rely on the works of the Law are under a curse, because it is written, Everyone is cursed who does not keep on doing all the things that have been written in the Law scroll.
References for Galatians 3:10
But since no one is made righteous by the Law as far as God is concerned, it is clear that the righteous one will live on the basis of faith.
References for Galatians 3:11
The Law isn't based on faith; rather, the one doing these things will live by them.
References for Galatians 3:12
Christ redeemed us from the curse of the Law by becoming a curse for us—because it is written, Everyone who is hung on a tree is cursed.
References for Galatians 3:13
He redeemed us so that the blessing of Abraham would come to the Gentiles through Christ Jesus, and that we would receive the promise of the Spirit through faith.
Brothers and sisters, I'll use an example from human experience. No one ignores or makes additions to a validated will.
The promises were made to Abraham and to his descendant. It doesn't say, "and to the descendants," as if referring to many rather than just one. It says, "and to your descendant," who is Christ.
I'm saying this: the Law, which came four hundred thirty years later, doesn't invalidate the agreement that was previously validated by God so that it cancels the promise.
If the inheritance were based upon the Law, it would no longer be from the promise. But God has given it graciously to Abraham through a promise.