Narrated Sa'id bin al-Musaiyab:

'Umar bin al-Khattab (RA) said: "If any man married a woman and after sleeping with her finds that she is affected with leprosy or insane, she gets her dowry (if he divorces her) for having intercourse with her, and it is returned to him from the one who has deceived him with her." [Sa'id bin Mansur, Malik and Ibn Abu Shaibah reported it. It's narrated are reliable (thiqah)].

وَعَنْ سَعِيدِ بْنِ اَلْمُسَيَّبِ ; أَنَّ عُمَرَ بْنَ اَلْخَطَّابِ ‏- رضى الله عنه ‏- قَالَ : { أَيُّمَا رَجُلٍ تَزَوَّجَ اِمْرَأَةً , فَدَخَلَ بِهَا , فَوَجَدَهَا بَرْصَاءَ , أَوْ مَجْنُونَةً , أَوْ مَجْذُومَةً , فَلَهَا اَلصَّدَاقُ بِمَسِيسِهِ إِيَّاهَا , وَهُوَ لَهُ عَلَى مَنْ غَرَّهُ مِنْهَا } أَخْرَجَهُ سَعِيدُ بْنُ مَنْصُورٍ , وَمَالِكٌ , وَابْنُ أَبِي شَيْبَةَ , وَرِجَالُهُ ثِقَاتٌ [1]‏ .‏