1 Corinthians 5 is a conversation about immorality within the Christian community. Paul talks about a man who was having an affair with his stepmother, and how the rest of the community was tolerating and even boasting about it. Paul rebukes them for their lack of discipline and says that they should expel the immoral man from their midst. He also stresses the importance of upholding Christian moral standards and purity, and warns against the danger of allowing sin to go unchecked.