Titus 3:10
After a first and second warning reject a divisive man [who promotes heresy and causes dissension—ban him from your fellowship and have nothing more to do with him],
Romans 16:17
I urge you, brothers and sisters, to keep your eyes on those who cause dissensions and create obstacles or introduce temptations [for others] to commit sin, [acting in ways] contrary to the doctrine which you have learned. Turn away from them.
2 John 1:10
If anyone comes to you and does not bring this teaching [but diminishes or adds to the doctrine of Christ], do not receive or welcome him into your house, and do not give him a greeting or any encouragement;
Matthew 18:15-17
1 Corinthians 5:4-13
In the name of our Lord Jesus, when you are assembled, and I am with you in spirit, with the power of our Lord Jesus,
1 Corinthians 11:19
for [doubtless] there have to be factions among you, so that those who are of approved character may be clearly recognized among you.
2 Corinthians 13:2
I have already warned those who have sinned in the past and all the rest as well, and I warn them now even though I am absent [from you] as I did when I was with you the second time, that if I come back I will not spare anyone,
Galatians 5:12
I wish that those who are troubling you [by teaching that circumcision is necessary for salvation] would even [go all the way and] castrate themselves!
Galatians 5:20
2 Thessalonians 3:6
Now we command you, believers, in the name of our Lord Jesus Christ and by His authority, that you withdraw and keep away from every brother or sister who leads an undisciplined life and does not live in accordance with the tradition and teaching that
2 Thessalonians 3:14
Now if anyone [in the church] does not obey what we say in this letter, take special note of that person and do not associate with him, so that he will be ashamed and repent.
2 Timothy 3:5
holding to a form of [outward] godliness (religion), although they have denied its power [for their conduct nullifies their claim of faith]. Avoid such people and keep far away from them.
2 Peter 2:1
But [in those days] false prophets arose among the people, just as there will be false teachers among you, who will subtly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction on themselves.