You better be more specific.
"Think not that I have come to abolish the law and the prophets; I have come not to abolish them but to fulfil them. For truly, I say to you, till heaven and earth pass away, not an iota, not a dot, will pass from the law until all is accomplished. Whoever then relaxes one of the least of these Commandments and teaches men so, shall be called least in the kingdom of heaven; but he who does them and teaches them shall be called great in the kingdom of heaven. For I tell you, unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven." (Matthew 5:17-20 RSV)
Modern Christians read Matthew's text in one sense -- that they know God's Law and it ain't everything that is in the Torah, just the bits they like.
Clearly there's another way to read the passage that is less amenable to gentile practices then and now. If you look over the entirety of Jesus life, he was pretty scrupulous in keeping the practices as they were understood in that day and he argued interpretation using the Torah, not some outside agency. Even his fulfillment of prophecy appeals to the Torah at every turn. Thus, Jesus NEVER abandoned the Law & the Prophets. he fulfilled them.
Jesus also admonished his followers to follow the Torah in every instance -- asking them if they performed their ritual duties and such. Thus, he expected his followers to be like him, a practicing Jew who obeyed the Law & the Prophets.
In the epistles, Peter (a little) and Paul (the most) argued for a divergence from Judaic practices, even arguing that it wasn't necessary to be a Jew, just a Christian. I do not believe Jesus ever said that. If he meant to break so cleanly with Judaism, why did he not? Fear? I don't think arguing that Jesus feared anything is going to be a fruitful path of argument.
When I have cured a skin disease, first thing I do is go to the nearest rabbi to have it confirmed that I am clean of the disease.