Excerpt form A HANDBOOK OF BIBLE LAW by Charles A. Weisman
Page 11 and 12

When the laws, commandments, statutes and judgments were reveled by God through Moses, the intent was that they were "always" to be kept (Deut. 5:29), and were to be observed "forever" (Deut. 12:28; 19:9).

A rather recent doctrine which theologians and preachers have been espousing is that the laws laid down in the Old Testament were only a temporary arrangement and that the advent of Jesus Christ made them null and void. This false doctrine has a great appeal to the carnal nature of man, as it relieves him of responsibility allowing him to completely act according to his will rather than the will of God. Yet when men act according to their will or carnal nature, committing adultery, theft, drunkenness, etc., those same preachers in their hypocrisy start to preach against the "sin" they are committing. What is sin but "transgression of the law" (1 John 3:4). If one says there is no law that we are under then they are saying there is no sin, and they "make God a liar" (1 John 1:10).

Christ clearly taught to keep the Moral Law of God (Matt 19:18-19), and expressed the importance of adhering to the writings of "Moses and the Prophets" (Matt 22:37-40; Luke 16:29-31; John 5:46-47). The Apostle Paul also taught that the Law of God is to be kept (1 Corinth 7:19). All eternal principles of right and wrong are determined by this law. If it can be taught that there is no perpetual law of God we are bound to, then all concepts of right and wrong will be arbitrarily made up by some man.

It is well understood that the requirements to keep the blood rituals, ceremonial acts and sacrificial ordinances were abolished by Jesus Christ through His death and resurrection. But that concept has erroneously been expanded to encompass all the laws and commandments. The Moral Law of God existed before Moses (Gen 26:5), it existed after the death and resurrection of Christ (1 Corinthians 9:9; James 2:8-11), it was promised to continue to exist in the future (Heb 8:10), and it was made known that Christians were to keep that law in the future (Rev 14:12).