Galatians 3:17-19

17What I mean is this: The law that came 430 years later does not revoke the covenant previously established by God, so as to nullify the promise. 18For if the inheritance depends on the law, then it no longer depends on a promise; but God freely granted it to Abraham through a promise.

19Why then was the law given? It was added because of transgressions, until the arrival of the seed to whom the promise referred. It was administered through angels by a mediator.