Some Protestant scholars have argued that Christian Sunday worship traces back even further, to the resurrection appearances of Jesus recorded in the Gospel narratives where Jesus would appear to his disciples on the first day of the week [REF].
Seventh-day Adventist scholar Samuele Bacchiocchi has argued that Sunday worship unconnected to Sabbath was introduced in Rome in the 2nd century, and was later enforced throughout the Christian church as a substitution for Sabbath worship [REF].