Epistle to Philemon
Paul says that Onesimus has been very helpful to him while he was in prison in Rome.  He would like for Philemon to free him and send him back to Rome.  Paul says that Philemon should receive him not as a slave but as a brother. Paul did not seem to think that Onesimus should be punished, even though Roman law allowed the owner of a runaway slave to punish or even kill them.