I urge you, brothers and sisters, to keep an eye on those who create dissensions and hindrances, in opposition to the teaching that you have learned; avoid them.
I warned those who sinned previously and all the others, and I warn them now while absent, as I did when present on my second visit, that if I come again I will not be lenient—
Now we command you, brothers and sisters, in the name of our Lord Jesus Christ, to keep away from every brother or sister living irresponsibly and not according to the tradition that they received from us.
But false prophets also arose among the people, just as there will be false teachers among you, who will secretly bring in destructive opinions. They will even deny the Master who bought them—bringing swift destruction on themselves.