Whosoever puts away his wife, and marries another, commits adultery: and whosoever marries her that is put away from her husband commits adultery.
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Ambrose of Milan
AD 397
He had above proposed that the kingdom of God should be preached. When he had said that one tittle cannot fall from the law, he added, “Everyone who puts away his wife, and marries another, commits adultery.” The apostle rightly admonishes, saying that this is a great sacrament concerning Christ and the church. You find a marriage that doubtlessly was joined by God, when he himself says, “No man comes to me, unless my Father who sent me has drawn him.” He alone could join this marriage. Solomon mystically said, “A wife will be prepared for a man by God.” The man is Christ, and the wife is the church that is a wife in love and a virgin in innocence. Do not let him whom God has drawn to the Son be separated by persecution, distracted by extravagance, ravaged by philosophy, tainted by Manichaeus, perverted by Arius, or infected by Sabellius. God has joined; let not a Jew separate. All who desire to defile the truth of faith and wisdom are adulterers…. Come, Lord Jesus, to find your bride ...
Who are we to say that someone commits adultery in taking another woman after he puts away his wife, and that another who, in doing this, does not commit adultery? The Gospel says that everyone who performs such an act commits adultery. If everyone who marries another woman after the dismissal of his wife commits adultery, this includes the one who puts away his wife without the cause of immorality and the one who puts away his wife for this reason.
But Christ prohibits divorce, saying, "Whosoever putteth away his wife, and marrieth another, committeth adultery; and whosoever marrieth her that is put away from her husband, also committeth adultery.".
His words are: "Whosoever putteth away his wife, and marrieth another, committeth adultery; and whosoever marrieth her that is put away from her husband, also committeth adultery"