[Machine] I got married to a woman whom I did not consummate the marriage with, then her mother impressed me, so I divorced the woman and married her mother. Abdullah came to Al-Madina and asked the Prophet's companions ﷺ , and they said it is not permissible. Then he went to the Banu Shamkh and asked, "Where is the man who married the mother of the woman who was under him?" They said, "He is here." He said, "Let him divorce her." They said, "But she is pregnant with his child." He said, "Let him divorce her, for it is forbidden by Allah." And that is the meaning.  

إِنِّي تَزَوَّجْتُ امْرَأَةً لَمْ أَدْخُلْ بِهَا ثُمَّ أَعْجَبَتْنِي أُمُّهَا فَأُطَلِّقُ الْمَرْأَةَ وَأَتَزَوَّجُ أُمَّهَا؟ قَالَ نَعَمْ فَطَلَّقَهَا فَتَزَوَّجَ أُمَّهَا فَأَتَى عَبْدُ اللهِ الْمَدِينَةَ فَسَأَلَ أَصْحَابَ النَّبِيِّ ﷺ فَقَالُوا لَا تَصْلُحُ ثُمَّ قَدِمَ فَأَتَى بَنِي شَمْخٍ فَقَالَ أَيْنَ الرَّجُلُ الَّذِي تَزَوَّجَ أُمَّ الْمَرْأَةِ الَّتِي كَانَتْ تَحْتَهُ؟ قَالُوا هَاهُنَا قَالَ فَلْيُفَارِقْهَا قَالُوا وَقَدْ نَثَرَتْ لَهُ بَطْنُهَا؟ قَالَ فَلْيُفَارِقْهَا فَإِنَّهَا حَرَامٌ مِنَ اللهِ ﷻ وَبِهَذَا الْمَعْنَى