According to the Jewish rules, nobody was allowed to do work on the Sabbath. There was no buying and selling.  The Sabbath was the day of the week that was holy. You could go to the synagogue and read the Bible. You could teach, but no working! Jesus taught at the synagogue and noticed a man there with a withered hand. What would the Pharisees say if Jesus asked them, "Is it okay to heal this man's hand?"