This is based on the Fourth Commandment, which states, “Remember to keep holy the Sabbath day.” Sunday is considered the Sabbath in the Christian faith, and Mass is the central act of worship in the Catholic Church.
The Code of Canon Law, which is the set of laws that govern the Catholic Church, states that “On Sundays and other holy days of obligation, the faithful are obliged to participate in the Mass.” (Canon 1247) In addition, Canon 918 states, “A person who assists at a Mass celebrated anywhere in a Catholic rite either on the feast day itself or in the evening of the preceding day satisfies the obligation of participating in the Mass.”
Therefore, it is considered a serious obligation to attend Mass on Sundays and holy days of obligation. It is generally considered a sin to intentionally and deliberately skip Mass without a valid reason. However, it is important to note that the Church recognizes that there may be circumstances in which an individual can’t attend Mass, such as due to illness or other serious obligations. In such cases, the obligation to attend Mass may be fulfilled through other means, such as by participating in Mass via television or radio or by making a spiritual communion.
It is always important to remember that the Church’s teachings on the obligation to attend Mass are meant to help Catholics grow in their faith and to participate fully in the life of the Church. They are not intended to be burdensome or to cause undue stress. If you are struggling with the obligation to attend Mass, it may be helpful to speak with a priest or other trusted spiritual advisor for guidance and support.