The Canons of the Council in Trullo; Often Called The Quinisext Council 26Canon XXVI.

If a presbyter has through ignorance contracted an illegal marriage, while he still retains the right to his place, as we have defined in the sacred canons, yet he must abstain from all sacerdotal work. For it is sufficient if to such an one indulgence is granted. For he is unfit to bless another who needs to take care of his own wounds, for blessing is the imparting of sanctification. But how can he impart this to another who does not possess it himself through a sin of ignorance? Neither then in public nor in private can he bless nor distribute to others the body of Christ, [nor perform any other ministry]; but being content with his seat of honour let him lament to the Lord that his sin of ignorance may be remitted. For it is manifest that the nefarious marriage must be dissolved, neither can the man have any intercourse with her on account of whom he is deprived of the execution of his priesthood.