the ten commandments ended with Jesus the rules changed study the new testament for differences I think that one was replaced in acts 20:7 :upon the first day of the week... ...Jesus said this do in remembrance of me.
So basically that is right! Why is there such a thing called the New Testament .. Like what? I am Jewish and I go by the old one and it makes so much more sence! Like it is supposed to be Saturday not Sunday... Try to go on YouTube and you will understand more why things in Christianity don't make sence.. Or at least to me!:)