But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.

After

"If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother.

I warned those who sinned in the past and all the others, and I warn them now while absent, as I did when present the second time, that if I come again I will not spare them

Reject

I urge you, brethren, to take note of those who cause divisions and difficulties, contrary to the doctrine which you have learned; avoid them.

In the name of our Lord Jesus, when you are assembled, and I with you in spirit, and the power of our Lord Jesus is present,

I wish that those who are troubling you would mutilate themselves!

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.

holding a form of godliness but denying its power. Avoid such people.

If anyone comes to you and does not bring this teaching, do not receive him into your house or give him any greeting;