Why do Christians observe the first day of the week?

The shift from the Sabbath, the seventh day, to the first day of the week reflects the early church’s recognition of Jesus' resurrection. Acts 20:7 narrates how the disciples gathered on the first day to break bread, marking it as a key day for worship and remembrance of Christ's work. This practice highlights the victory of Christ over death and affirms the believers' new identity and rest found in Him. The first day symbolizes a transition from the old covenant to the new covenant, where salvation and rest are secured through Jesus Christ, making this day a celebration of grace and resurrection.