The Canons of the Council in Trullo; Often Called The Quinisext Council 58Canon LVIII.

None of those who are in the order of laymen may distribute the Divine Mysteries to himself if a bishop, presbyter, or deacon be present. But whoso shall dare to do such a thing, as acting contrary to what has been determined shall be cut off for a week and thenceforth let him learn not to think of himself more highly than he ought to think.