Gal 3:8 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.What scripture is this?
Genesis 12:3
I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you."
Genesis 18:18
Abraham will surely become a great and powerful nation, and all nations on earth will be blessed through him.
Genesis 22:18
and through your offspring all nations on earth will be blessed, because you have obeyed me."
Genesis 26:4
I will make your descendants as numerous as the stars in the sky and will give them all these lands, and through your offspring all nations on earth will be blessed,
Is this what you were asking for?