Matthew 18:17

17Ifἐὰνnowδὲhe fails to listenπαρακούσῃto themαὐτῶν,tell [it]εἰπὸνto theτῇchurchἐκκλησίᾳ·Ifἐὰνnowδὲalsoκαὶto theτῆςchurchἐκκλησίαςhe fails to listenπαρακούσῃ,let him beἔστωto youσοιasὥσπερtheὁpaganἐθνικὸςandκαὶtheὁtax collectorτελώνης.

And if he may fail to hear them, say [it] to the church. And if he may fail to hear even the church, let him be unto you as the Gentile and the tax collector.