Brethren, I speak in the manner of men: Though it is only a man’s covenant, yet if it is confirmed, no one annuls or adds to it. 16 Now to Abraham and his Seed were the promises made. He does not say, “And to seeds,” as of many, but as of one, “And to your Seed,” who is Christ. 17 And this I say, that the law, which was four hundred and thirty years later, cannot annul the covenant that was confirmed before by God in Christ, that it should make the promise of no effect. 18 For if the inheritance is of the law, it is no longer of promise; but God gave it to Abraham by promise.
Paul stresses that there is only one spiritual seed of Abraham. It is not to do with Jewish nationality or race, but with trusting God’s promise. In that sense, Abraham is the father of all who are justified by faith in God’s promise, whether Jew or Gentile. The arrival of the law, 430 years after the promise to Abraham, cannot annul that fact. In Christ we are saved through trusting God’s promise. [The Bible Panorama.]