Canon 56
On the excommunication of clergy who offend a presbyter or deacon.
If any cleric insults a presbyter or deacon, let him be excommunicated.
Greek original
Εἴ τις κληρικὸς ὑβρίσοι πρεσβύτερον, ἢ διάκονον, ἀφοριζέσθω.
Parallel canons
IВс.18Трул.7Лаод.20Вас.88