That was one of the things that they would learn in the synogogues every sabbath as they heard the Law of Moses read to them.
We will just have to disagree. If Sabbath keeping were to be an essential part of the New Covenant relationship with God it would have been mentioned in the discussion because it would have been an unfamiliar practice to the Gentiles.
Sabbath keeping was not even discussed because it was not a requirement for New Covenant believers. I believe that is why the duty to keep the Seventh day as Sabbath is not mentioned ONCE in the New Testament?
Thats my story and I'm sticking to it. Take care.