1 Corinthians 6:8

Nay, but ye yourselves do wrong, and defraud, and that your brethren.

There were some in the Corinthian congregation who made a habit of defrauding their brethren, using sinful devices, procuring advantage by the instrumentality of the pagan system of justice. Such persons would have been those who were skilled in such lawsuits, or those who through some circumstance might have enjoyed preferment in such courts. In any case, some of the Christians were being defrauded by other members of the church.