The Mosaic Law Code is specifically rescinded at
Acts 15.
5But some believers from the party of the Pharisees stood up and declared, “The Gentiles must be circumcised and required to obey the law of Moses.”
Over the next few verses the Apostles discuss the matter. Peter begins speaking afterwards.
10Now then, why do you test God by placing on the necks of the disciples a yoke that neither we nor our fathers have been able to bear?
11On the contrary, we believe it is through the grace of the Lord Jesus that we are saved, just as they are.”
The law of Moses is a yoke nobody can bear and is contrasted with the Grace of Jesus. Peter further details their reasoning over several verses but here's the conclusion:
19It is my judgment, therefore, that we should not cause trouble for the Gentiles who are turning to God.
20Instead, we should write and tell them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals, and from blood.
So everything from the Old Testament except idolatry, sexual immorality, strangled things, and blood is kaput. Circumcision is out, cloth of mixed threads is in, and you don't need to sacrifice animals anymore.