Правило 30
About the ban on washing in public baths with women.
About the fact that clergy, or clerics, or monks should not wash in the bathhouse together with women, and in general, no lay Christian, for this, first of all, causes criticism from the pagans.
Greek original
Ὅτι οὐ δεῖ ἱερατικούς, ἢ κληρικούς, ἢ ἀσκητάς, ἐν βαλανείῳ μετὰ γυναικῶν ἀπολούεσθαι, μηδὲ πάντα Χριστιανόν, ἢ λαϊκόν· αὕτη γὰρ πρώτη κατάγνωσις παρὰ τοῖς ἔθνεσιν.
Parallel canons
Трул.77