Galatians 3:18-22

For if the inheritance is based on law, it is no longer based on a promise; but God has granted it to Abraham by means of a promise.

Why the Law then? It was added on account of the violations, having been ordered through angels at the hand of a mediator, until the Seed would come to whom the promise had been made.

Now a mediator is not for one party only; but God is only one.

Is the Law then contrary to the promises of God? Far from it! For if a law had been given that was able to impart life, then righteousness would indeed have been based on law.

But the Scripture has confined everyone under sin, so that the promise by faith in Jesus Christ might be given to those who believe.