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Augustine of Hippo
Catena Aurea · Matthäusevangelium 5
Mt 5, Verses 31–32English original
It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement: But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
(lib. 83. Quæst. q. ult.) If any affirm that the only fornication for which the Lord allows divorce is that of earnal sin, he may say that the Lord has spoken of believing husbands and wives, forbidding either to leave the other except for fornication.