It is widely reported that there is sexual immorality among you, and the kind of sexual immorality that is not even condoned among the Gentiles-a man is living with his father's wife.
References for 1 Corinthians 5:1
And you are inflated with pride, instead of filled with grief so that he who has committed this act might be removed from among you.
For though absent in body but present in spirit, I have already decided about him who has done this thing as though I were present.
In the name of our Lord Jesus, when you are assembled, along with my spirit and with the power of our Lord Jesus,
turn that one over to Satan for the destruction of the flesh, so that his spirit may be saved in the Day of the Lord.
Your boasting is not good. Don't you know that a little yeast permeates the whole batch of dough?
Clean out the old yeast so that you may be a new batch, since you are unleavened. For Christ our Passover has been sacrificed.
References for 1 Corinthians 5:7
Therefore, let us observe the feast, not with old yeast, or with the yeast of malice and evil, but with the unleavened bread of sincerity and truth.
I wrote to you in a letter not to associate with sexually immoral people-
References for 1 Corinthians 5:9
by no means referring to this world's immoral people, or to the greedy and swindlers, or to idolaters; otherwise you would have to leave the world.
But now I am writing you not to associate with anyone who bears the name of brother who is sexually immoral or greedy, an idolater or a reviler, a drunkard or a swindler. Do not even eat with such a person.
References for 1 Corinthians 5:11