Galatians 3:17-21

17This is what I mean: the law, which came 430 years afterward, does not annul a covenant previously ratified by God, so as to make the promise void.

18For if the inheritance comes by the law, it no longer comes by promise; but God gave it to Abraham by a promise.

19Why then the law? It was added because of transgressions, until the offspring should come to whom the promise had been made, and it was put in place through angels by an intermediary.

20Now an intermediary implies more than one, but God is one.

21Is the law then contrary to the promises of God? Certainly not! For if a law had been given that could give life, then righteousness would indeed be by the law.