Paul taught in
Gal 3:10 that anyone who keeps law is under a curse.
Galatians 3:10 KJV For
as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.
In my opinion, it is sever error to say the Jewish concerts to Christianity were expected to continue in law. Paul spoke about being one who is AS a Jew and AS under the law to them under law, implying he did not personally keep law of his own sake.
1 Corinthians 9:20 KJV And
unto the Jews I became as a Jew, that I might gain the Jews;
to them that are under the law, as under the law, that I might gain them that are under the law;