All in Christ

As the perfect embodiment of the moral law of God, Jesus Christ bids us come to him and find rest (a term loaded with exodus echoes). He also bids us be united to him through faith in the power of the Spirit, so that as he places his yoke (of law) on our shoulders we hear him say, “My yoke is easy and my burden is light.”
So we are Ephesians 2: 15– 16 Christians: the ceremonial law is fulfilled.
We are Colossians 2: 14– 17 Christians: the civil law distinguishing Jew and Gentile is fulfilled.
And we are Romans 8: 3– 4 Christians: the moral law has also been fulfilled in Christ. But rather than being abrogated, that fulfillment is now repeated in us as we live in the power of the Spirit.
In Christ then, we truly see the telos of the law. And yet as Paul also says, “Do we abrogate the law by teaching faith in Christ? No. We strengthen it. For Christ did not come to abolish it but to fulfill it, so that it might in turn be fulfilled in us.” That is why in Romans 13: 8– 10, Ephesians 6: 1, and in other places the apostle takes for granted the abiding relevance of the law of God for the life of the believer.
The Old Testament saint knew that while condemned by the law he had breached, its ceremonial provisions pointed him to the way of forgiveness. He saw Christ as really (if opaquely) in the ceremonies as he did in the prophecies. He also knew as he watched the sacrifices being offered day after day and year after year that this repetition meant these sacrifices could not fully and finally take away sin— otherwise he would not need to return to the temple precincts. He was able to love the law as his rule of life because he knew that God made provision for its breach, pointed to redemption in its ceremonies, and gave him direction through its commandments.
It should not, therefore, surprise us or grieve us to think that the Christian sees Christ in the law. He or she also sees it as a rule of life; indeed, sees with Calvin that Christ is the life of the law because without Christ there is no life in the   law.
We appreciate the clarity of the law only when we gaze fully into Christ’s face. But when we do gaze there, we see the face of one who said, “Oh how I love your law; it is my meditation all the day” — and we want to be like   him.
This is not— as the antinomian feared— bondage. It is freedom. The Christian rejoices therefore in the law’s depth. He seeks the Spirit’s guidance for its application, because he can say with Paul that in Christ through the gospel he has become an “in-law.”
At the end of the day the antinomian who regards the moral law as no longer binding is forced into an uncomfortable position. He must hold that an Old Testament believer’s passionate devotion to the law (of which devotion, curiously, the majority of Christians feel they fall short) was essentially a form of legalism. But it is Jesus himself who shows an even deeper intensity in the law by expounding its deep meaning and penetration into the heart.
Neither the Old Testament believer nor the Savior severed the law of God from his gracious person. It was not legalism for Jesus to do everything his Father commanded him. Nor is it for   us.

Sinclair B Ferguson: The Whole Christ: Legalism, Antinomianism, and Gospel Assurance—Why the Marrow Controversy Still Matters (pp. 172-173)