Cyprian : In the first Epistle of Paul to the Thessalonians: "That a man do not deceive his brother in a matter, because God is the avenger for all these." — Treatise XII Three Books of Testimonies Against the Jews John Chrysostom : "That no man transgress, and wrong his brother in the matter." He has well said, "that no man transgress." To each man God has assigned a wife, he has set bounds to nature, that intercourse with one only: therefore intercourse with another is transgression, and the taking of more than belongs to one, and robbery; or rather it is more cruel than any robbery; for we grieve not so much, when our riches are carried off, as when marriage is invaded. Dost thou call him brother, and wrongest him, and that in things which are unlawful? Here he speaks concerning adultery, but above also concerning "all fornication." For since he was about to say, "That no man transgress and wrong his brother," Do not think, he says, that I say this only in the case of brethren; you must not have the wives of others at all, nor even women that have no husbands, and that are common. You must abstain from "all fornication"; "Because," he says, "the Lord is an avenger in all these things." He exhorted them first, he shamed them, saying, "even as the Gentiles." Then from reasonings he showed the impropriety of defrauding a brother. Afterwards he adds the principal thing; "Because," he says, "the Lord is an avenger in all these things, as also we forewarned you and testified." For we do not these things without being punished, neither do we enjoy so much pleasure, as we undergo punishment. — Homily on 1 Thessalonians 5