2 Thessalonians 3:14

“And if he refuses to listen to them, tell it to the church; and if he refuses to listen even to the church, let him be to you as the Gentile and the tax collector.

Now I urge you, brothers, to keep your eye on those who cause dissensions and stumblings contrary to the teaching which you learned, and turn away from them.

And when this letter is read among you, have it also read in the church of the Laodiceans; and you, for your part read my letter that is coming from Laodicea.

Now we command you, brothers, in the name of our Lord Jesus Christ, that you keep away from every brother who walks in an unruly manner and not according to the tradition which they received from us.

sound in word which is irreproachable, so that the opponent will be put to shame, having nothing bad to say about us.

If anyone comes to you and does not bring this teaching, do not receive him into your house, and do not give him a greeting,