Whoever therefore breaks one of the least of these commandments, and teaches men so, shall be called least in the kingdom of heaven; but whoever does and teaches them, he shall be called great in the kingdom of heaven. Matthew 5:19

This verse is a serious warning to many today who actively teach that the Old Testament law (and indeed the entire OT) does not apply to New Testament believers. This kind of teaching is serious error.

There was a teacher a few years ago who criticized the evangelistic methods of Living Waters (Ray Comfort) for using the OT law evangelistically with Gentiles because, according to that teacher, the Law was only for Israel and not for Gentiles. His flawed teaching said it is not a sin for Gentiles to break the OT law. Preposterous! We may call it the OT law, but it is God’s Law.

Beware of those who discount the importance of the OT for Christians today (particularly Gentile Christians).

Properly understood, the OT law, and indeed the entire OT, is just as much the Word of God as is the New Testament.

That does not mean that keeping God’s Law is a means of salvation. It has never been and never will be. But it is by God’s Law that we are made aware of our guilt before a holy God, causing the elect to flee to Jesus for forgiveness.

Romans 3:20 Therefore by the deeds of the law no flesh will be justified in His sight, for by the law is the knowledge of sin.
Galatians 3:24 Therefore the law was our tutor to bring us to Christ, that we might be justified by faith.