Webster(i)
19 What purpose then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.
20 Now a mediator is not a mediator of one; but God is one.
21 Is the law then against the promises of God? By no means: for if there had been a law given which could give life, verily righteousness would have been by the law.