Show me a statement where any one of the Apostles states that they are no longer obliged to rest on the seventh day.
(And don't pull the Protestant stunt of citing a broad quote from Scripture that doesn't mention the actual subject matter.)
Acts 15 is not vague. It is clear. Gentile believers were not under the Law. Peter, Paul and the other Apostles stated that this message was from the Holy Spirit and from them.
And yet; CatholicISM teaches that Mary was sinless...