There were two Jewish practices that particularly identified the Jews in the first century: The Sabbath and circumcision. And circumcision became a major bone of contention while the Sabbath did not. This is what makes the silence regarding the Sabbath so significant. When a major change was contemplated, it made waves.
There were Pharisees who had come to believe that Jesus was the Messiah (acts 15;5). Now can you imagine this group of people not being Sabbath keepers as well? It is inconceivable.
Why, then, was the Sabbath not an issue while circumcision was? The answer is simple enough. There was nothing in Paul's work with the Gentiles to change anything regarding the Sabbath.
http://www.abcog.org/ntsab.htm
http://www.stanford.edu/group/King/publications/papers/vol1/500215-The_Influence_of_the_Mystery_Religions_on_Christianity.htm
There were Pharisees who had come to believe that Jesus was the Messiah (acts 15;5). Now can you imagine this group of people not being Sabbath keepers as well? It is inconceivable.
Why, then, was the Sabbath not an issue while circumcision was? The answer is simple enough. There was nothing in Paul's work with the Gentiles to change anything regarding the Sabbath.
http://www.abcog.org/ntsab.htm
http://www.stanford.edu/group/King/publications/papers/vol1/500215-The_Influence_of_the_Mystery_Religions_on_Christianity.htm