Titus 3:10–11
10 As for a person who bstirs up division, cafter warning him once and then twice, have nothing more to do with him, 11 knowing that such a person is warped and sinful; he is self-condemned.
2 Thessalonians 3:14–15
14 If anyone does not obey what we say in this letter, take note of that person, and have nothing to do with him, that he may be ashamed. 15 mDo not regard him as an enemy, but warn him as a brother.