Acts 3:25

And I will bless those who bless you, And the one who curses you I will curse. And in you all the families of the earth will be blessed.”

since Abraham will surely become a great and mighty nation, and in him all the nations of the earth will be blessed?

“In your seed all the nations of the earth shall be blessed, because you have listened to My voice.”

who are Israelites, to whom belongs the adoption as sons, and the glory and the covenants and the giving of the Law and the temple service and the promises,

Now the promises were spoken to Abraham and to his seed. He does not say, “And to seeds,” as referring to many, but rather to one, “And to your seed,” that is, Christ.