Legalistic attempts have been made to rob the Sabbath of its worship and joy by carefully mandating what can and cannot be done. However, Jesus seemed to have intentionally lived in public view to serve as a contrary model of the Sabbath than that given by other legalistic teachers. For example, Jesus healed on the Sabbath (Matthew 12:1–14, John 9:1–17), taught on the Sabbath (Mark 6:1–2), and promoted evangelism on the Sabbath (John 7:21–24). Jesus demonstrated that the Sabbath is not to be enforced legalistically, but that it exists for worshipful fun and rest. Furthermore, our true Sabbath is not in a day but ultimately in a saving relationship with Jesus where we can rest from trying to earn our salvation and rest in His finished work (Matthew 11:28–30; Romans 4:5; Colossians 2:16–17). Therefore, the Sabbath is not a law for believers to obey, but instead a grace to enjoy.
In conclusion, by setting aside a day, we are showing that we are a people who are set aside (holy) and who rest in Jesus. Worshiping is our primary objective and our weeks are purposefully ordered around worship. Then, our worshipful work can be rightly undertaken.
Summarily, what activities you do or don't do on the Sabbath is not the main issue. Remember, Jesus attended worship, taught and applied the Scriptures, performed acts of mercy and encouraged others to do the same, AND He rested from some of His usual labor. The issue if whether you trust in God, and devote the time we would have spent working on worshipping Him. If we don't trust in Him and devote time to worship Him, that is sin. So I'll end with a question for you: Have you taken a break from your work or school during this week to rest and trust in God?
[Answered by Pastor HM, who takes the sabbath on Monday, since he technically works on Sunday]