Sunday is the day on which the paschal mystery is celebrated in light of the apostolic tradition and is to be observed as the foremost holy day of obligation in the universal Church (CCC 2177). It is the first day of the week and the 'eighth day' of the new creation (CCC 2174).
The Lord's Day
Christians gather on Sunday to hear the word of God and take part in the Eucharist, calling to mind the Passion, Resurrection, and glory of the Lord Jesus (CCC 2177-2179).
Frequently Asked Questions
What are the requirements for Sunday? Participation in the Mass and resting from servile labor that would prevent the worship due to God or the proper relaxation of mind and body (CCC 2180-2185).
May the Lord bless you and keep you.