Romans 4:25

who was delivered for our offenses, and was raised again for our justification.

What is written of Abraham in this chapter and in other parts of the Bible, especially in the book of Genesis, is not written for the sake of Abraham alone. The story of the faith and consequent justification of Abraham was not included in Scriptures with the mere intention of offering a correct history of the patriarch, to let posterity know that his faith was imputed to him for righteousness. Throughout the discussion, Abraham must he regarded as a representative of all believers. What became true in his case will become true of all men that stand in the same relation to God. The Lord has only one method of justifying sinners. So the record of Abraham's faith is preserved for our sake, for the sake of the believers of the New Testament; for it is the intention of God that the same righteousness is to be imputed to us also, if we believe on Him that raised Jesus, our Lord, from the dead. Jesus was not one of the ordinary mortals whom the almighty power of God called back to life in a miracle, such as are recorded in the gospels and in several books of the Old Testament, but He is the Lord, our great Representative and Head. And therefore the act of raising Jesus from the dead was a proclamation that He is in reality what He claimed to be, the Son of God and our Redeemer. Since the resurrection of Christ was the decisive evidence of the divinity of His work and the validity of all His claims, therefore to believe that He arose from the dead is to believe that He is the Son of God, the atonement for our sins, the Redeemer and Lord of men. He was delivered for our offenses, and raised again for our justification. On account of our offenses, our sins and transgressions, God raised Christ from the dead, because His object was to justify us, and this object was attained in the resurrection. Thus the resurrection of Christ effected our justification. The expiation through Christ's sufferings on the cross, the atonement of death, have been sealed by the resurrection of Christ; for it is a declaration before all the world that the object of Christ's death has been gained, that God has accepted the reconciliation, that the victory of Jesus is a formal and solemn absolution which God has pronounced upon sinful mankind. And so He is our Lord, and we have become His own. By the faith which God wrought in our hearts, we have accepted His atonement and are declared to be righteous in the sight of God.

Summary

Abraham is the spiritual father of all believers, inasmuch as they all, like him, are justified by faith alone, through grace, thus receiving the inheritance, inasmuch as the faith of Abraham lives in all believers, disregarding their own person and clinging to the promise of God alone.