Philemon 1:12

Whom I have sent again - The Christian religion never cancels any civil relations; a slave, on being converted, and becoming a free man of Christ, has no right to claim, on that ground, emancipation from the service of his master. Justice, therefore, required St. Paul to send back Onesimus to his master, and conscience obliged Onesimus to agree in the propriety of the measure; but love to the servant induced the apostle to write this conciliating letter to the master.