2 John 1:10
If any one comes to you and does not bring this Teaching, do not receive him into your house or welcome him;
Titus 3:10
If a man is causing divisions among you, after warning him once or twice, have nothing more to say to him.
Galatians 1:8-9
Yet even if we--or if an angel from Heaven were to tell you any other 'Good News' than that which we told you, may he be accursed!
Romans 16:17-18
I urge you, Brothers, to be on your guard against people who, by disregarding the teaching which you received, cause divisions and create difficulties; dissociate yourselves from them.
1 Corinthians 5:11
But, as things are, I say that you are not to associate with any one who, although a Brother in name, is immoral, or covetous, or an idolater, or abusive, or a drunkard, or grasping-no, not even to sit at table with such people.
2 Thessalonians 3:6
We urge you, Brothers, in the name of the Lord Jesus Christ, to avoid any Brother who is living an ill-ordered life, which is not in agreement with the teaching that you received from us.
2 Thessalonians 3:14
If any one disregards what we have said in this letter, mark that man and avoid his company, that he may feel ashamed.
1 Corinthians 16:22
Accursed be any one who has no love for the Lord. THE LORD IS COMING.
2 Timothy 3:5-6
and while they retain the outward form of religion, they will not allow it to influence them. Turn your back on such men as these.
2 John 1:11
for the man who welcomes him is sharing with him in his wicked work.