Those Who Are in Need of Excommunication

Because there are always some who hold God and his Word in contempt, who take account of neither injunction, exhortation nor remonstrance, thus requiring greater chastisement, we hold the discipline of excommunication to be a thing holy and salutary among the faithful, since truly it was instituted by our Lord with good reason. This is in order that the wicked should not by their damnable conduct corrupt the good and dishonour our Lord, and that though proud they may turn to penitence. Therefore we believe that it is expedient according to the ordinance of God that all manifest idolaters, blasphemers, murderers, thieves, lewd persons, false witnesses, sedition-mongers, quarrellers, those guilty of defamation or assault, drunkards, dissolute livers, when they have been duly admonished and if they do not make amendment, be separated from the communion of the faithful until their repentance is known.  – Calvin (The Genevan Confession)

Amen.