How do we know church discipline is necessary?

The necessity of church discipline is affirmed by Paul in 1 Corinthians 5, where he highlights how sin, if left unaddressed, can spread like leaven and corrupt the entire congregation. Paul’s directive to expel the immoral brother is grounded in the need to safeguard the community and honor the name of Christ. It's an act of protecting the church's witness and ensuring that all members are encouraged to pursue holiness. The goal is not merely punitive; instead, it reflects a desire for genuine repentance and reconciliation, demonstrating the church's commitment to living in accordance with God's holiness.