1st Corinthians 5:10

7 Purge out the old yeast, that you may be a new lump, even as you are unleavened. For indeed Christ, our Passover, has been sacrificed in our place.

8 Therefore let us keep the feast, not with old yeast, neither with the yeast of malice and wickedness, but with the unleavened bread of sincerity and truth.

9 I wrote to you in my letter to have no company with sexual sinners;

10 yet not at all meaning with the sexual sinners of this world, or with the covetous and extortioners, or with idolaters; for then you would have to leave the world.

11 But as it is, I wrote to you not to keep company, if any man who is named a brother is a sexual sinner, or covetous, or an idolater, or a slanderer, or a drunkard, or an extortioner. Don`t even eat with such a person.

12 For what have I to do with also judging those who are outside? Don`t you judge those who are within?

13 But those who are outside, God judges. "Put away the wicked man from among yourselves."