Matthew 5:18-19 says the OT rules still apply:
"Till heaven and earth pass, one jot or tittle shall nowise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven."
On the other hand, there are plenty of contradictory verses on this matter: Skeptic's Annotated Bible: Contradictions
"Till heaven and earth pass, one jot or tittle shall nowise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven."
On the other hand, there are plenty of contradictory verses on this matter: Skeptic's Annotated Bible: Contradictions