The apostle Paul's letter to his friend and fellow Christian Philemon, which focuses on the question of slavery, has long inspired debate. Onesimus, one of Philemon's slaves and a Christian himself, has left his master's house and sought refuge with Paul. In a letter to Philemon, Paul assures his friend that he is sending Onesimus back into captivity, but pleads for mercy on the slave's behalf, asking Philemon to treat him as a beloved brother and...