Jesus Himself, in the Sermon on the Mount, said that you will be counted great in the kingdom if you do and teach the least of these commandments which are found in the law; of which not one jot or tittle shall be removed from it until heaven and earth pass away (Matthew 5:17-20). This teaching is one of many of "the perfect teachings of Christ."
And this is one of the reasons why you have so many denominations and confusion. People get lost in the timeline of the scriptures and put them all in the blender and hit puree. Christ did not come to abolish the law. The law will remain until all things are complete. It is sacrilegious to add anything, take away anything, change anything, and the most of all dissecting the law and follow some of it. If you look to the law to follow them, just one, you are obliterated to follow all 613 Mosaic Laws, and if you don't you are guilty of transgressing all of them all at once.
The Jews are still under the Old Covenant with God...the Jews are still obligated to follow the law....they can't but that is a different story. Christian are not obligated to follow the law and you cannot be in both Covenants. If you look to the law for righteousness you are severed from Christ and have fallen from grace.
This is what people do not get, in most instances in the Gospels, Christ is talking to Jews about Judaism, about the Mosaic Law. The Jewish leaders and scribes are not coming to Christ to ask Him...test Him....about Christianity. He is not telling them that He is the Son of God and they should believe in Him and be baptized, They are asking Him about Jewish laws.
In rare cases when they came to Him alone He would give them indirect answers about salvation. Even the rich man, he did not tell him to believe in Him and be baptized. And Nicodemus...we do not even know what question he asked Christ, Christ just started talking about being born again and it is clear he found it confusing and there is no evidence that he understood what Christ said. Ergo the fact that many are still confused about it today. Christ ministry in the Gospels was first to the Jews...the Gentiles turn would come with Paul.
After the first Council in Jerusalem~~Paul and Peter and John understood. James took on the leadership role of what came to be known as Jewish-Christians. The Jewish-Christians worshiped on the Sabbath and maybe on Sunday too. And they did dabble with the law. This is one of the reasons that the Judaizers were harassing Paul. This particular sect of Christianity died out with the Jewish-Christian Apostles. As time went on Paul made it clear that Christians were not under the law nor should they follow the law...none of them. Because if he did, he would be in violation of the law...it is all or nothing. no exceptions.