"I divorced my wife when she was menstruating. 'Umar went to the Prophet and told him about that. The Prophet said: 'Tell him to take her back, then when she becomes pure, if he wants to, let him divorce her.'" I said to Ibn 'Umar: "Did that count as one divorce?" He said: "Why not? What do you think if some becomes helpless and behaves foolishly." (Using translation from Nasāʾī 3555)
طَلَّقْتُ امْرَأَتِي وَهِيَ حَائِضٌ فَأَتَى النَّبِيَّ ﷺ عُمَرُ فَذَكَرَ لَهُ ذَلِكَ فَقَالَ النَّبِيُّ ﷺ «فَلْيُرَاجِعْهَا فَإِذَا طَهُرَتْ يَعْنِي فَإِنْ شَاءَ فَلْيُطَلِّقْهَا » قُلْتُ لِابْنِ عُمَرَ فَاحْتَسِبْ بِهَا قَالَ مَا يَمْنَعُهُ أَرَأَيْتَ إِنْ عَجَزَ وَاسْتَحْمَقَ