Sabbath law was not reaffirmed in new covenant. Gentiles never subject to it. Christ is now our Sabbath rest. I can provide your support and mine if you prefer.
You are absolutely insane. Show me in the scripture where it says not to follow the Sabbath. CHRIST himself followed the Sabbath. The Sabbath was made for ALL men. Please show me where it says it's only for the Hebrews. Christ is now our rest? What the does that even mean? Christ said he came to fulfill the law, NOT CHANGE IT. So while yes, the law is specifically for the Children of Israel aka Hebrews aka Negros, any gentile wish to be grafted in will have to follow God's Law.
So yes, please provide scripture. I will do the same. Keep one thing mind, the Bible should be read line upon line, line upon line precept upon precept, here a little, there a little. That's how scripture should be read according to the bible. Christians are good for taking my people's book and taking a verse and making it apart of their doctrine. Instead of using the whole idea or thought as intended.