You are the LORD, the God Who chose Abram and brought him out of UR of the Chaldees and gave him the name Abraham.
You found his heart faithful before You, and You made the covenant with him...
And he [Abram] BELIEVED in (trusted in, relied on, remained steadfast to) the Lord, and He counted it to him as righteouseness (right standing with God).
And He said to him, I am the [same] Lord, Who brought you out of UR of the Chaldees to give you this land as an inheritance.
And IN your Seed [CHRIST] shall ALL THE NATIONS OF THE EARTH BE BLESSED...because you have heard and obeyed My voice.
You are the descendants (sons) of the prophets and the heirs of the covenant which God made and gave to your forefathers, saying to Abraham, AND IN YOUR SEED (HEIR) SHALL ALL THE FAMILIES OF THE EARTH BE BLESSED AND BENEFITED.
And the Scriptures, forseeing that God would justify (declare righteous, put in right standing with Himself) the Gentiles in consequence of faith, proclaimed the Gospel [foretelling the glad tidings of a Savior long beforehand] to Abraham in the promise, saying, IN YOU SHALL ALL THE NATIONS [OF THE EARTH] BE BLESSED.
Now the promises (covenants, agreements) were decreed and made to Abraham and his Seed. God does not say, And to seeds, as if referring to many persons, but, AND TO YOUR SEED, OBVIOUSLY REFERRING TO ONE INDIVIDUAL, WHO IS CHRIST THE MESSIAH.