وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ قَالَ أَيُّمَا رَجُلٍ تَزَوَّجَ امْرَأَةً وَبِهِ جُنُونٌ أَوْ ضَرَرٌ فَإِنَّهَا تُخَيَّرُ فَإِنْ شَاءَتْ قَرَّتْ وَإِنْ شَاءَتْ فَارَقَتْ ‏.‏ قَالَ مَالِكٌ فِي الأَمَةِ تَكُونُ تَحْتَ الْعَبْدِ ثُمَّ تَعْتِقُ قَبْلَ أَنْ يَدْخُلَ بِهَا أَوْ يَمَسَّهَا إِنَّهَا إِنِ اخْتَارَتْ نَفْسَهَا فَلاَ صَدَاقَ لَهَا وَهِيَ تَطْلِيقَةٌ وَذَلِكَ الأَمْرُ عِنْدَنَا ‏.‏

Yahya related to me from Malik that he had heard that Said ibnal-Musayyab said that if a man married a woman, and he was insane orhad a physical defect, she had the right of choice. If she wished shecould stay, and if she wished she could separate from him. Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1185
Web Ref:  Muwatta Imam Malik Book 29 Hadith 28