1 Corinthians 5:11 NIV

2 Thessalonians 3:14 NIV
Take special note of anyone who does not obey our instruction in this letter. Do not associate with them, in order that they may feel ashamed.

2 Thessalonians 3:6 NIV
In the name of the Lord Jesus Christ, we command you, brothers and sisters, to keep away from every believer who is idle and disruptive and does not live according to the teaching you received from us.

Matthew 18:17 NIV
If they still refuse to listen, tell it to the church; and if they refuse to listen even to the church, treat them as you would a pagan or a tax collector.

Romans 16:17 NIV
I urge you, brothers and sisters, to watch out for those who cause divisions and put obstacles in your way that are contrary to the teaching you have learned. Keep away from them.