Then what about Sunday? Is it right to substitute this day for Saturday as the day of rest? … if we look at the writings of ecclesiastical historians of the second and third centuries after Christ, we find that they testify that the practice of Christian believers meeting on the first day, instead of the seventh, was universally observed. So again we must go to the Bible to determine if there was a Scriptural basis for this change and we discover the Bible to be completely silent regarding the transfer of Sabbath observance to Sunday. On the other hand the apostle Paul says “One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind” (Rom 14:5). He says further “Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. These are a shadow of the things that were to come; the reality, however, is found in Christ” (Col 2:16-17 NIV). The only law laid upon believers in this respect was to “forsake not the assembly of themselves together”, with no reference to any particular day.
So, for the Christian, there is no required Sabbath observance today, but there is the hope of that great anti-typical Sabbath Day of rest, which Jesus who is the Lord of the Sabbath, will inaugurate when he comes back to earth again. While Jesus remains away, every day should be patterned after the principles of the Sabbath day, in which all who call themselves Christian should rest or refrain from the works of the flesh and devote their lives to doing the will of Christ.
The Origin of the Organic World – Part One