I urge you, brothers and sisters, to keep an eye on those who cause dissensions and offenses, in opposition to the teaching that you have learned; avoid them.
If the member refuses to listen to them, tell it to the church; and if the offender refuses to listen even to the church, let such a one be to you as a Gentile and a tax collector.
Since we have heard that certain persons who have gone out from us, though with no instructions from us, have said things to disturb you and have unsettled your minds,
for you are still of the flesh. For as long as there is jealousy and quarreling among you, are you not of the flesh, and behaving according to human inclinations?
See to it that no one takes you captive through philosophy and empty deceit, according to human tradition, according to the elemental spirits of the universe, and not according to Christ.
Now we command you, beloved, in the name of our Lord Jesus Christ, to keep away from believers who are living in idleness and not according to the tradition that they received from us.
I urge you, as I did when I was on my way to Macedonia, to remain in Ephesus so that you may instruct certain people not to teach any different doctrine,
They went out from us, but they did not belong to us; for if they had belonged to us, they would have remained with us. But by going out they made it plain that none of them belongs to us.