But I beg you, brothers, to take note of those who cause dissensions and offenses contrary to the doctrine that you have learned, and to turn away from them.
Woe to a world that leads people astray! Although it is necessary for temptations to arise, nevertheless: Woe to that man through whom temptation arises!
but only because of false brothers, who were brought in unknowingly. They entered secretly to spy on our liberty, which we have in Christ Jesus, so that they might reduce us to servitude.
See to it that no one deceives you through philosophy and empty falsehoods, as found in the traditions of men, in accord with the influences of the world, and not in accord with Christ.
But we strongly caution you, brothers, in the name of our Lord Jesus Christ, to draw yourselves away from every brother who is walking in disorder and not according to the tradition that they received from us.
Now I asked you to remain at Ephesus, while I went into Macedonia, so that you would speak strongly against certain ones who have been teaching a different way,
They went out from among us, but they were not of us. For, if they had been of us, certainly they would have remained with us. But in this way, it is made manifest that none of them are of us.