Under the Old Covenant, Saturday was the day for worship. But all Christians (except Seventh Day Adventists) worship on Sunday. There is not a lot of support for a change in the day of worship in Sacred Scripture, yet the day was changed. Here are the passages I found in the New Testament describing certain activities happening “on the first day” or “the Lord’s day” (Sunday): Mark 16:2, Mark 16:9, Luke 24:1, John 20:1, John 20:19, Acts 20:7, 1 Cor. 16:2, Rev. 1:10.
The Old Testament also shows another meaningful day: “the eighth day.” Eight days after a male child was born, he would be circumcised (Gen. 17:12). Similarly, eight days after the sabbath is the first day, Sunday. Look at a calendar, put your finger on any Saturday, then count forward each day. When you count up to eight you will be on the first day of the following week, which will be a Sunday.
The Scripture is clear about the requirement to worship on the sabbath. Yet the Scripture references above don’t add up to a clear argument for changing the day of worship and rest. Relying on Sacred Scripture alone to make that argument doesn’t seem very persuasive to me. If you read each of the New Testament verses above, you will see that they are all descriptive; none are imperative. Here is an example of an imperative statement:
“You shall love the Lord your God…”
This can be found in Matt. 22:37, Mark 12:30, and Luke 10:27. It is easy for us to understand him regarding what we are supposed to do, but he does not then change when we are to do it. There is no explicit command in Sacred Scripture to change the day of rest and worship from Saturday to Sunday.
The New Covenant ushered in a new way to worship. It follows then that it ushered in a new day to worship. The Catechism of the Catholic Church (CCC) has a lot to say about this but these two references make the point:
1166 By a tradition handed down from the apostles which took its origin from the very day of Christ’s Resurrection, the Church celebrates the Paschal mystery every seventh day, which day is appropriately called the Lord’s Day or Sunday. The day of Christ’s Resurrection is both the first day of the week, the memorial of the first day of creation, and the “eighth day,” on which Christ after his “rest” on the great Sabbath inaugurates the “day that the Lord has made,” the “day that knows no evening.”
2174 Jesus rose from the dead “on the first day of the week.” Because it is the “first day,” the day of Christ’s Resurrection recalls the first creation. Because it is the “eighth day” following the sabbath it symbolizes the new creation ushered in by Christ’s Resurrection.
Sunday as the day of worship proclaims the most important aspect of the New Covenant, Christ’s resurrection.
See also: Tradition precedes Scripture.