Galatians 3:18-22

18For if the inheritance depends on the law, then it no longer depends on the promise; but God in his grace gave it to Abraham through a promise. 19Why, then, was the law given at all? It was added because of transgressions until the Seed to whom the promise referred had come. The law was given through angels and entrusted to a mediator.

20A mediator, however, implies more than one party; but God is one. 21Is the law, therefore, opposed to the promises of God? Absolutely not! For if a law had been given that could impart life, then righteousness would certainly have come by the law.

22But Scripture has locked up everything under the control of sin, so that what was promised, being given through faith in Jesus Christ, might be given to those who believe.