Galatians 3:18-20

For 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. Why, 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. A mediator, however, implies more than one party; but God is one.