Which are the chief commandments, or laws, of the Church? The chief commandments, or laws, of the Church are these six:

1. To assist at Mass on all Sundays and holydays of obligation.
2. To fast and to abstain on the days appointed.
3. To confess our sins at least once a year.
4. To receive Holy Communion during the Easter time.
5. To contribute to the support of the Church.
6. To observe the laws of the Church concerning marriage.

What sin does a Catholic commit who through his own fault misses Mass on a Sunday or holyday of obligation? A Catholic who through his own fault misses Mass on a Sunday or holyday of obligation commits a mortal sin.

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