Paul's writing demolishes the idea that "fulfilling" the Mosaic law was some mystical woo-woo phenomenon that could only be accomplished by God dying on the cross.
In Matthew 5 Jesus states that he came to "fulfill" the law.
Every Christian cites this passage as proof Jesus taught that, after his crucifixion, the Mosaic Law would no longer be in effect.
Paul is the guy who declared the Law abolished. But ironically, Paul's writing demolishes the idea that "fulfilling" the Mosaic Law was some mystical woo-woo phenomenon that could only be accomplished by God dying on the cross.
"Let no debt remain outstanding, except the continuing debt to love one another, for he who loves his fellowman has fulfilled the law. The commandments, "Do not commit adultery," "Do not murder," "Do not steal," "Do not covet," and whatever other commandment there may be, are summed up in this one rule: "Love your neighbor as yourself." Love does no harm to its neighbor. Therefore love is the fulfillment of the law" (Romans 13:8-10)
Paul makes it clear that anyone can fulfill the law simply by loving others. And Jesus makes it clear that loving others does not abolish the law. By saying, "I have come to fulfill the law", Jesus was simply vowing that He came to love others.
Now that the false equivalence of "fulfill" and "abolish" has been debunked, it can be said that Jesus never so much as hints that the Mosaic law is coming to an end.
And neither does any passage in the Old Testament.
Jeremiah 31:33-34, for instance, simply says that the law will be written on the hearts and in the minds of everyone. By no means does it say that the Mosaic Law will ever be abolished.
The new covenant does not abolish the Mosaic Law. It simply writes it on the hearts and in the minds of all people.
152 Long ago I learned from your statutes that you established them to last forever.
160 All your words are true; all your righteous laws are eternal. (Psalm 119)
The bottom line is that there is a very good reason the Jews were chasing Paul down the street for declaring the law abolished: Paul was a heretic. And Jesus would not have agreed with him either.