Believers could not preach against the law in the synagogues or they would be crusified like Christ was. They could sit there and listen to the law if they wanted. It was in conflict with the law of Moses. The jews kept the sabbath but never had rest. Rest came by faith not works.I have no problem with keeping sabbath and would go to a sabbath keeping church if it was not legalistic. I have only found a few in California SDA, but most of there churches are legalistic.