There is no law in the New Testament or command or rule given to the Church to keep the Sabbath, or even Sunday as the rightful church day. Sunday is not a day that replaced the Sabbath, or the only day we are required to assemble and worship. The Bible makes it indisputably clear that we are absolutely not required to keep the Sabbath, festivities, or any other day. Here it is:

“So don’t let anyone condemn you for what you eat or drink, or for not celebrating certain holy days or new moon ceremonies or Sabbaths. For these rules are only shadows of the reality yet to come. And Christ himself is that reality.” Colossians 2:16-17 NLT

God’s desire is that we worship and serve Him continually, every day, not just on Saturday or Sunday. That is why there is no explicit biblical command that either Saturday or Sunday must be the day of worship! That’s why the scriptures also say;

“In the same way, some think one day is more holy than another day, while others think every day is alike. You should each be fully convinced that whichever day you choose is acceptable. Those who worship the Lord on a special day do it to honor Him.” Romans 14:5-6 NLT