1 Corinthians 5

5 hand this man over to Satan for the destruction of the flesh, so that his spirit may be saved on the day of the Lord.
The Body of Christ the Church is supposed to be reflective of God which is why when sin is left unchecked or tolerated, it can cause division or corrupt the church. While it is important to hold people accountable for their actions, excommunication should be the last resort. This is often the most painful but also the most loving disciplinary action to take, as when we abandon a brother or sister to their hedonistic lifestyle, they'll hopefully feel the error of their ways and repent. I'm certainly hope I won't have to go so far as in to rebuke a brother/sister to this extent but if I think in the context of the eternal state of their soul, these unfortunate endeavours might be necessary.