
Augustine of Hippo
Catena Aurea · Matthäusevangelium 5
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.
(de Fid. et Op. 16.) He also rightly puts away his wife to whom she shall say, I will not be your wife unless you get me money by robbery; or should require any other crime to be done by him. If the husband here be truly penitent, he will cut off the limb that offends him.