"The Prophet was asked about a man who divorced his wife three times, then another man married her and he closed the door and drew the curtain, then divorced her before consummating the marriage with her. He said: "She is not permissible for the first one (to remarry her) until the second one has had intercourse with her."" (Using translation from Nasāʾī 3415)
سُئِلَ النَّبِيُّ ﷺ عَنِ الرَّجُلِ يُطَلِّقُ امْرَأَتَهُ ثَلَاثًا فَيَتَزَوَّجُهَا الرَّجُلُ فَيُغْلِقُ الْبَابَ وَيُرْخِي السَّتْرَ ثُمَّ يُطَلِّقُهَا قَبْلَ أَنْ يَدْخُلَ بِهَا قَالَ «لَا تَحِلُّ لِلْأَوَّلِ حَتَّى يُجَامِعَهَا الْآخَرُ» قَالَ أَبُو عَبْدِ الرَّحْمَنِ وَهَذَا أَوْلَى بِالصَّوَابِ مِنَ الَّذِي قَبْلَهُ وَاللهُ أَعْلَمُ