2 John 1:10
If anyone comes to you without bringing this teaching, do not let him come into the house or bid him good morning.
Titus 3:10
If a man is inclined to a sect, after warning him once or twice, have nothing more to do with him.
Galatians 1:8-9
But even if we or an angel from heaven preach to you good news that contradicts the good news we have preached to you, a curse upon him!
Romans 16:17-18
I beg you, brothers, to be on the watch for those who introduce divisions and difficulties, in opposition to the instruction that you were given, and to avoid them.
1 Corinthians 5:11
What I meant was that you are not to associate with anyone who is supposed to be a Christian brother, and yet is immoral or greedy or idolatrous or abusive or drunken or grasping??ith such a person you must not even eat.
2 Thessalonians 3:6
We charge you, brothers, in the name of the Lord Jesus Christ, to keep away from any brother who lives in idleness, instead of following the teaching you received from us.
2 Thessalonians 3:14
If anyone refuses to obey what we have said in this letter, mark the man and do not have anything to do with him, to make him feel ashamed.
1 Corinthians 16:22
A curse upon anyone who has no love for the Lord. Lord, come quickly!
2 Timothy 3:5-6
keeping up the forms of religion, but resisting its influence. Avoid such people.
2 John 1:11
For anyone who bids him good morning shares in his wicked work.