Have no fellowship with the unfruitful works of darkness, but rather reprove [them].
Be not deceived: evil communications corrupt good manners.
Know ye not that a little leaven leaveneth the whole lump? Purge out therefore the old leaven. . . . I wrote unto you in an epistle not to company with fornicators: yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world. But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.–That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world.
In a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour.
Eph 5:11 1Co 15:33 5:6,7,9-11 Php 2:15 2Ti 2:20