1 Corinthians 6:1

How dare he. It was the custom at Corinth to sue each other in the heathen courts of justice over worldly matters, often over unimportant things. After becoming Christians, they had continued to do this. This showed a lack of trust in the church-leaders, and gave the heathen reason to think that the Christians were hostile to each other. [Paul himself did not hesitate to use his Roman citizenship and appeal his case to Roman justice. Yet he did not do this in matters between brother and brother, nor to accuse his persecutors (Acts 28:19), only for his defence.]