Now I urge you, brothers and sisters, to watch out for those who create dissensions and obstacles contrary to the teaching that you learned. Avoid them!
I said before when I was present the second time and now, though absent, I say again to those who sinned previously and to all the rest, that if I come again, I will not spare anyone,
But we command you, brothers and sisters, in the name of our Lord Jesus Christ, to keep away from any brother who lives an undisciplined life and not according to the tradition they received from us.
But false prophets arose among the people, just as there will be false teachers among you. These false teachers will infiltrate your midst with destructive heresies, even to the point of denying the Master who bought them. As a result, they will bring swift destruction on themselves.