A scripture on the tricky business of way church discipline.
If your brother sins against you, go and show him his fault, just between the two of you. If he listens to you, you have won your brother over. But if he will not listen, take one or two others along, so that every matter may be established by the testimony of two or three witnesses. (Matthew 18:15-16)
From Article 14 of the Confession of Faith from a Mennonite Perspective:
We believe that the practice of discipline in the church is a sign of God’s offer of forgiveness and transforming grace to believers who are moving away from faithful discipleship or who have been overtaken by sin. Discipline is intended to liberate erring brothers and sisters from sin, to enable them to return to a right relationship with God, and to restore them to fellowship in the church. It also gives integrity to the church’s witness and contributes to the credibility of the gospel message in the world.According to the teaching of Jesus Christ and the apostles, all believers participate in the church’s mutual care and discipline as appropriate. Jesus gave the church authority to discern right and wrong and to forgive sins when there is repentance or to retain sins when there is no repentance. When becoming members of the church, believers therefore commit themselves to give and receive counsel within the faith community on important matters of doctrine and conduct.