Правило 40
An order for bishops to participate in councils.
About the fact that bishops, when they are called to the Council, should not neglect this, but should go to teach or study for the sake of the structure of the Church and the rest. If the invitee neglects this, he will subject himself to accusation, unless he remains due to difficult circumstances.
Greek original
Ὅτι οὐ δεῖ ἐπισκόπους καλουμένους εἰς σύνοδον καταφρονεῖν, ἀλλ᾽ ἀπιέναι, καὶ διδάσκειν, ἢ διδάσκεσθαι, εἰς κατόρθωσιν τῆς ἐκκλησίας καὶ τῶν λοιπῶν. Εἰ δὲ καταφρονήσειεν ὁ τοιοῦτος, ἐαυτὸν αἰτιάσεται, παρεκτὸς εἰ μὴ δι᾽ ἀνωμαλίαν ἀπολιμπάνοιτο.
Parallel canons
Ап.37IВс.5IVВс.19Трул.8VIIВс.6Антиох.20Карф.187695