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

After

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

I have said beforehand, and I do say beforehand, as when I was present the second time, so now, being absent, I write to those who have sinned before now, and to all the rest, that, if I come again, I will not spare;

Reject

Now I beg you, brothers, look out for those who are causing the divisions and occasions of stumbling, contrary to the doctrine which you learned, and turn away from them.

In the name of our Lord Jesus Christ, you being gathered together, and my spirit, with the power of our Lord Jesus Christ,

I wish that those who disturb you would cut themselves off.

Now we command you, brothers, in the name of our Lord Jesus Christ, that you withdraw yourselves from every brother who walks in rebellion, and not after the tradition which they received from us.

holding a form of godliness, but having denied its power. Turn away from these, also.

If anyone comes to you, and doesn't bring this teaching, don't receive him into your house, and don't welcome him,