2 John 1:10
If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting;
Titus 3:10
Warn a man who is factious once, and then warn him a second time. After that, have nothing to do with him,
Galatians 1:8-9
But even if we, or an angel from heaven, should preach to you a gospel contrary to what we preached to you, let him be accursed!
Romans 16:17-18
I urge you, brethren, to take note of those who cause divisions and difficulties, contrary to the doctrine which you have learned; avoid them.
1 Corinthians 5:11
But actually, I wrote to you not to associate with any one who bears the name of brother if he is an immoral person, or greedy, or an idolater, or a reviler, or a drunkard, or a swindlernot even to eat with such a one.
2 Thessalonians 3:6
Now we command you, brethren, in the name of our Lord Jesus Christ, that you keep away from every brother who is living in idleness and not according to the tradition which you received from us.
2 Thessalonians 3:14
If anyone does not obey our instruction in this letter, take special note of that person and do not associate with him, so that he may be ashamed.
1 Corinthians 16:22
If anyone does not love the Lordlet him be accursed. Come, O Lord!
2 Timothy 3:5-6
holding a form of godliness but denying its power. Avoid such people.
2 John 1:11
for he who greets him shares in his wicked work.