Hadith 31-117

وَبِهذَا الإِسنادِ قالَ: قالَ عَلِىُّ بْنُ أَبِي طالِب‏ عَلَيْهِ السَّلامُ: سُئِلَ النَّبِيُ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ عَنِ امْرَأَة قِيلَ: إِنَّها زَنَت، فَذَكَرَتِ المَرْأَةُ أَنَّها بِكْرٌ، فَأَمَرَنِي النَّبِيُ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ أَن آمُرَ النِّساءَ أَن يَنْظُرنَ إِلَيْها فَنَظَرنَ إِلَيْها فَوَجَدنَها بِكراً، فَقالَ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: ما كُنْتُ لأَضرِبَ من عَلَيْهِ خاتَمٌ مِنَ اللَّهِ، وَكانَ يُجِيزُ شَهادَةَ النِّساءِ فِي مِثلِ هذا.

According to the same documentation, Ali ibn Abi Talib (a.s.) said, “The Prophet (S) was told that a woman had committed adultery while she claimed that she was a virgin. Then the Prophet (S) asked some women to check her up. They checked her hymen and found her to be a virgin. Then the Prophet (S) said, “I cannot beat one upon whom there is Divine Seal.” He (a.s.) accepted the women’s testimony in this case and considered it correct.”