Hebrews 2:2-3

2For if the message given through angels [the Law given to Moses] was authentic and unalterable, and every violation and disobedient act received an appropriate penalty,

3how will we escape [the penalty] if we ignore such a great salvation [the gospel, the new covenant]? For it was spoken at first by the Lord, and it was confirmed to us and proved authentic by those who personally heard [Him speak],