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Letters of Basil · Saint Basil the Great
When public punishment fails to bring a man to his senses, or exclusion from the prayers of the Church to drive him to , it only remains to treat him in accordance with our Lord’s directions—as it is written, “If thy brother shall trespass against thee….tell him his fault between thee and him;…if he will not hear thee, take with thee another;” “and if he shall” then “neglect to hear, tell it unto the Church; but if he neglect to hear even the Church, let him be unto thee henceforth as an heathen man, and as a publican.” Now all this we have done in the case of this fellow. First, he was accused of his fault; then he was convicted in the presence of one or two witnesses; thirdly, in the presence of the Church. Thus we have made our solemn protest, and he has not listened to it. Henceforth let him be excommunicated.
BasEp 288.1.3