Why do Christians observe the Lord's Day on Sunday?

The observance of Sunday as the Lord's Day is rooted in the resurrection of Jesus, which occurred on the first day of the week. This significance is affirmed in John 20:1, where Mary Magdalene visits the tomb on the first day. The early church recognized this day as sacred, gathering to celebrate Christ’s victory over death and to hear the gospel. While the Sabbath is traditionally observed on Saturday, Christians honor Sunday as a day of rest and worship, reflecting the new life found in Christ's resurrection. This day serves as a reminder of our own resurrection and newness of life in Him.