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Canon LXXX.
The Quinisext Council in Trullo (692) · The Seven Holy Ecumenical Councils
If any bishop, or presbyter, or deacon, or any of those who are enumerated in the list of the clergy, or a layman, has no very grave necessity nor difficult business so as to keep him from church for a very long time, but being in town does not go to church on three consecutive Sundays—three weeks—if he is a cleric let him be deposed, but if a layman let him be cut off.
Trull 1.81.2
If anyone without the constraint of necessity leaves his church for three Lord’s days, he shall be deprived of communion.
Trull 1.81.5