1 Corinthians 4-6 Immorality Within the Church

Paul uses the metaphor of leaven to condemn immoral behavior within the church. The idea being that if sin is tolerated and excused, it will spread and infect others. He instructs them to expel flagrant sinners from the body. He also chastens them about taking disputes between brothers to the secular authorities. In cases where secular law does not comport with God's law injustice will be the result.