I am reading through Mark chapters 2 and 3 at the moment. The Sabbath becomes the topic in Mark 2:23 and the story and discussion about the Sabbath continues into Mark 3:6 I believe that chapter 2 should end at 3:6.
The whole passage is about the Sabbath and is a continuation of the story in 2 where Jesus heals the paralytic man, whom had been lowered through the roof to him by 4 of his friends. In that story Jesus declares his authority to forgive sins.
Following that, Jesus declares that the Sabbath was made for man and not that man was made for the Sabbath, and declared that because he was the Lord who could forgive, he was also the Lord of the Sabbath. Going into Mark 3, Jesus enters into the Synagogue, sees a man with a crippled hand, questions the congregation as to what is lawful on the Sabbath, do good, or do evil, and proceeds to heal his hand. Jesus then makes the declaration that he is the Lord of the Sabbath.
It’s an interesting question that Jesus asked about what is lawful to do on the Sabbath: Doing good or doing evil. Simply put, doing good was the lawful thing to do every day. The Sabbath wasn’t meant to be one day out of 7 to walk around being holier than thou. Instead, it was made for humanity to rest from their labours. It was a day to reflect on the goodness of God and fellowship rest with others. And it was a day like every other day to do that which was good. Simply put, God wants us to do that which is good, every day!