WCF 30.3.
Church censures are necessary, for the reclaiming and gaining of offending brethren, for deterring of others from like offenses, for purging out of that leaven which might infect the whole lump, for vindicating the honour of Christ, and the holy profession of the Gospel, and for preventing the wrath of God, which might justly fall upon the Church, if they should suffer His covenant, and the seals thereof, to be profaned by notorious and obstinate offenders. (1 Cor. 5, 1 Tim. 5:20, Matt. 7:6, 1 Tim. 1:20, 1 Cor 11:27–34, Jude 23)