And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, commits adultery: and whoever marries her who is put away does commit adultery.
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Rabanus Maurus
AD 856
There is then but one carnal cause why a wife should be put away, that is, fornication; and but one spiritual, that is, the fear of God. But there is no cause why while she who has been put away is alive, another should be married.