Galatians 3:15-17

New Catholic Bible

¹⁵ The Promise of the Covenant. Brethren, allow me to give you an everyday example. Once a human will has been ratified, no one can make further additions to it or set it aside. ¹⁶ Now the promises were made to Abraham and his descendant. It does not say “and to your descendants,” as referring to many, but it says “and to your descendant,” that is, to one person, who is Christ.

¹⁷ This is what I am saying: the Law, which came four hundred and thirty years later, cannot invalidate a covenant that had been previously ratified by God, so as to nullify the promise.