I just want to stress that 'works' or keeping the 10 commandments have nothing to do with us being saved. It would take away what Jesus did for us on the cross. We are to seek Jesus, not the law, and that includes the Sabbath. We are not required to keep the sabbath. That does not mean that one cannot give a day or week or year to the Lord, but we are not required to for righteousness.
Peter had the same problem even after he knew the truth. That is why Paul opposed Peter because Peter was falling back to the demands of the Law. If we are bound to the Law, Paul's preaching would have made no sense.
It is through Jesus Christ alone that we should seek, not the demands of the Law. Through Jesus we are righteous and are given new desires to please God.