CAB(i)
19 Why then the law? It was added on account of transgressions, until the Seed should come to whom it had been promised; and it was commanded through angels by the hand of a mediator.
20 Now the mediator is not for one person, but God is one.
21 Therefore, is the law against the promises of God? Certainly not! For if a law had been given which was able to give life, truly righteousness would have been by the law.