Galatians 3:17-19

Revised Standard Version Catholic Edition

¹⁷ This is what I mean: the law, which came four hundred and thirty years afterward, does not annul a covenant previously ratified by God, so as to make the promise void. ¹⁸ For if the inheritance is by the law, it is no longer by promise; but God gave it to Abraham by a promise.

The Purpose of the Law

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