The wife of Rifaʿa Al-Qurazi came to the Prophet ﷺ and said, "I was Rifaʿa's wife, but he divorced me and it was a final irrevocable divorce. Then I married ʿAbdur-Rahman bin Az-Zubair but he is impotent." The Prophet ﷺ asked her 'Do you want to remarry Rifaʿa? You cannot unless you had a complete sexual relation with your present husband." Abu Bakr was sitting with Messenger of Allah ﷺ and Khalid bin Saʿid bin Al-ʿAs was at the door waiting to be admitted. He said, "O Abu Bakr! Do you hear what this (woman) is revealing frankly before the Prophet ﷺ ?"  

عَنْ عَائِشَةَ ؓ جَاءَتِ امْرَأَةُ رِفَاعَةَ الْقُرَظِيِّ النَّبِيَّ ﷺ فَقَالَتْ كُنْتُ عِنْدَ رِفَاعَةَ فَطَلَّقَنِي فَأَبَتَّ طَلاَقِي فَتَزَوَّجْتُ عَبْدَ الرَّحْمَنِ بْنَ الزَّبِيرِ إِنَّمَا مَعَهُ مِثْلُ هُدْبَةِ الثَّوْبِ فَقَالَ أَتُرِيدِينَ أَنْ تَرْجِعِي إِلَى رِفَاعَةَ لاَ حَتَّى تَذُوقِي عُسَيْلَتَهُ وَيَذُوقَ عُسَيْلَتَكِ وَأَبُو بَكْرٍ جَالِسٌ عِنْدَهُ وَخَالِدُ بْنُ سَعِيدِ بْنِ الْعَاصِ بِالْبَابِ يَنْتَظِرُ أَنْ يُؤْذَنَ لَهُ فَقَالَ يَا أَبَا بَكْرٍ أَلاَ تَسْمَعُ إِلَى هَذِهِ مَا تَجْهَرُ بِهِ عِنْدَ النَّبِيِّ ﷺ  

A man divorced his wife thrice (by expressing his decision to divorce her thrice), then she married another man who also divorced her. The Prophet ﷺ was asked if she could legally marry the first husband (or not). The Prophet ﷺ replied, "No, she cannot marry the first husband unless the second husband consummates his marriage with her, just as the first husband had done."  

أَنَّ رَجُلاً طَلَّقَ امْرَأَتَهُ ثَلاَثًا فَتَزَوَّجَتْ فَطَلَّقَ فَسُئِلَ النَّبِيُّ ﷺ أَتَحِلُّ لِلأَوَّلِ قَالَ لاَ حَتَّى يَذُوقَ عُسَيْلَتَهَا كَمَا ذَاقَ الأَوَّلُ