Why do Messianic Believers worship on Saturday and not Sunday?
The early congregations of believers lived out the Sabbath regulations as a part of their lifestyle and faith practice. Sunday worship did not become a regular part of any worship experience until the second century A.D. To tell you the truth, the early believers worshipped the Messiah in community with others who were like minded or seeking, and they gathered daily as well as on the Sabbath.