Our Sunday Obligation


In accordance with the Third Commandment, the Catechism of the Catholic Church (2168-2195) deems it our obligation to attend mass on Sunday – unless there is a serious excuse for missing (for example, illness, the care of child, etc).  Deliberate failure to fulfill this obligation is to commit a grave sin. This, coupled with full knowledge and deliberate consent, constitutes mortal sin.

There are groups known as “Sabbatarians” who reject the idea of observing the Lord’s Day on Sunday.  They claim that the 3rd Commandment is very clear that the day of rest and observance is to be on Saturday.  Saturday was the day for observing the commandment I the Mosaic Law.  However, as Christians, we realize that Jesus is the fulfillment of the Law.

For the Jews in the Old Testament, the Sabbath was the seventh day on which the Lord rested after the Creation of the Heavens and the Earth.  In Col. 2:16, we read where St. Paul tells us, Let no one, then, pass judgment on you in matters of food and drink or with regard to a festival or new moon or sabbath.”  Furthermore, in the New Testament, we find that the Apostles and the early Christians worshipped and broke bread (celebrated the Mass) on the first day of the week, Sunday (Acts 20:7, 1 Cor. 16:2, Rev. 1:10).

Sunday became our day for observing the Third Commandment because it symbolizes the new creation that was ushered in by Christ's Resurrection. For Christians it is the first of all days, the first of all feasts, the Lord's Day.

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