Answer:
There are several places in Scripture that state the necessity for church discipline as well as the categories that require discipline.
First, difficulties between members of a local church could require church discipline (Mat. 18:15–17).
Secondly, church discipline is necessary to avoid divisions. Paul instructs elders to mark out those causing divisions for the purpose of discipline. If the leadership fails to discipline those causing divisions, then the church is going to face an unnecessary church split (Rom. 16:17–18).
Thirdly, church discipline is necessary for the purity of the church. This provides a category for church discipline: immorality. A person practicing or living in immorality must be disciplined by the local church (1 Cor. 5:9–13).
Fourthly, a necessity for church discipline is to bring the offender to repentance. If discipline is not exercised, repentance may never come (2 Cor. 2:5–11).
Fifth, a necessity for church discipline is to avoid disorderly conduct. The category requiring church discipline given by this passage refers to those who refuse to work. They should be disciplined by the church. The church has no responsibility to meet the needs of a member who refuses to work for a living (2 Thes. 3:6–15).
Sixth, church discipline is necessary in cases of false teaching. Anyone who has begun to teach falsely and is blaspheming is subject to church discipline (1 Tim. 1:8–20).
Seventh, church discipline is necessary to avoid crass sins. Sometimes in the exercise of church discipline, it is necessary to reprove someone in the sight of all, even as Paul had to do with Peter in Galatians 2:11–14 (1 Tim. 5:20).
Eighth, church discipline is necessary to avoid the spread of false teachings. If the church lets a false teacher go undisciplined, the false teachings will naturally spread. If the church disciplines the false teacher, then the false teachings will stop one way or another. Either the false teacher repents, or he leaves (2 Tim. 2:17–18).
Ninth, church discipline is necessary to avoid factious perversions (Titus 3:9–11).
Extract from Dr Arnold Fruchtenbaum's, Messianic Bible Study, MBS 106 The Local Church Pg 29-30
