There is one Gospel promise throughout all the scriptures. This is something that has been debated in church history with the extreme of Marcion denying the God of the Old Testament is the God of the New Testament. The struggle to see the unity of Scripture is addressed in the letter to the Hebrews. Christ is the character and the radiance of God. The Old Testament looking to his coming and the New Testament assures us that God's promise is set in stone because he has spoke through his word.