The Resurrected Lord Jesus Christ is in Person become the Law of the Word of God.
It is fruitless to even try discuss the Ten Commandments or and all other Old Testament Laws as if therein is still anything to be found which has and is not found existing and valid for the People of God of True Believers, that is, of Christians, in, through, by, with and for and to the glory and honour of Christ Crucified whom God raised in the flesh from death and the grave.
The only worth and virtue the OT still has, is the same and the only all the Scriptures including the New Testament have, and ever, have had, which is, to witness of the Alive and Living Personal Lord and God of all believers of all ages and dispensations and peoples and tongues and lands. In other words, as little as the Old Testament is identical with Jesus Christ, as little is the New Testament. But at the same time as fully and indispensable the New Testament is for a saving knowledge of and faith in Christ Jesus, as fully and indispensable is the Old Testament or Law and believing in it. So that there is between the Law and Prophets, and the Fulfilment or Gospel, no difference in any respect except in respect of the Author and Finisher of the only and saving Faith which is the Gift of God. That we love God because God, first, loved us. That, is Jesus Christ, our Law and Lord!