Judgment of Immorality
5 1 It is actually reported that there is sexual immorality among you, and such sexual immorality as is not even named among the Gentiles, that one has his father’s wife. 2 You are puffed up, and didn’t rather mourn, that he who had done this deed might be removed from among you. 3 For I most certainly, as being absent in body but present in spirit, have already, as though I were present, judged him who has done this thing. 4 In the name of our Lord Jesus Christ, you being gathered together, and my spirit, with the power of our Lord Jesus Christ, 5 are to deliver such a one to Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus. 6 Your boasting is not good. Don’t you know that a little yeast leavens the whole lump?
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 associate with anyone who is called a brother who 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.” 
5:13 Deuteronomy 17:7; 19:19; 21:21; 22:21; 24:7