The Canons of the Synods of Sardica, Carthage, Constantinople, and Carthage Under St. Cyprian, Which Canons Were Received by the Council in Trullo and Ratified by II. Nice 34Canon XI.

If any presbyter, inflated against his bishop, makes a schism, let him be anathema.

All the bishops said: If any presbyter shall have been corrected by his superior, he should ask the neighbouring bishops that his cause be heard by them and that through them he may be reconciled to his bishop: but if he shall not have done this, but, puffed up with pride, (which may God forbid!) he shall have thought it proper to separate himself from the communion of his bishop, and separately shall have offered the sacrifice to God, and made a schism with certain accomplices, let him be anathema, and let him lose his place; and if the complaint which he brought against his bishop shall [not] have been found to be well founded, an enquiry should be instituted.