Ibn ʿUmar divorced his wife while she was having her menses. ʿUmar asked the Prophet ﷺ who said, "Order him (your son) to take her back, and then divorced her before her period of the 'Iddah has elapsed." I asked Ibn ʿUmar, "Will that divorce (during the menses) be counted?" He replied, "If somebody behaves foolishly (will his foolishness be an excuse for his misbehavior)?"  

طَلَّقَ ابْنُ عُمَرَ امْرَأَتَهُ وَهْىَ حَائِضٌ فَسَأَلَ عُمَرُ النَّبِيَّ ﷺ فَأَمَرَهُ أَنْ يُرَاجِعَهَا ثُمَّ يُطَلِّقَ مِنْ قُبُلِ عِدَّتِهَا قُلْتُ فَتَعْتَدُّ بِتِلْكَ التَّطْلِيقَةِ قَالَ أَرَأَيْتَ إِنْ عَجَزَ وَاسْتَحْمَقَ  

"I asked Ibn 'Umar about a man who divorced his wife while she was menstruating. He said: 'Do you know 'Abdullah bin 'Umar?' He divorced his wife while she was menstruating, and 'Umar asked the Prophet about that, and he told him to take her back, then wait for the right time. I said to him: 'Was that divorce counted?' He said: 'Be quiet! What do you think if some becomes helpless and behaves foolishly?'"  

هَلْ تَعْرِفُ عَبْدَ اللَّهِ بْنَ عُمَرَ فَإِنَّهُ طَلَّقَ امْرَأَتَهُ وَهِيَ حَائِضٌ فَسَأَلَ عُمَرُ النَّبِيَّ ﷺ فَأَمَرَهُ أَنْ يُرَاجِعَهَا ثُمَّ يَسْتَقْبِلَ عِدَّتَهَا فَقُلْتُ لَهُ فَيَعْتَدُّ بِتِلْكَ التَّطْلِيقَةِ فَقَالَ مَهْ أَرَأَيْتَ إِنْ عَجَزَ وَاسْتَحْمَقَ  

Yunus bin Jubair said “I asked ‘Abd Allah bin ‘Umar “A man divorced his wife while she was menstruating? He said do you know ‘Abd Allah bin ‘Umar? He said, yes. ‘Abd Allah bin ‘Umar divorced his wife while she was menstruating. So, ‘Umar came to the Prophet ﷺ and asked him (about this matter). He said Command him to take her back in marriage he may the divorce her in the beginning of the waiting period. I (Ibn Jubair) asked him “Will this divorce be counted? He said “Why not?” If he was helpless and showed his foolishness (that would have been counted).  

فَإِنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ طَلَّقَ امْرَأَتَهُ وَهِيَ حَائِضٌ فَأَتَى عُمَرُ النَّبِيَّ ﷺ فَسَأَلَهُ فَقَالَ مُرْهُ فَلْيُرَاجِعْهَا ثُمَّ لْيُطَلِّقْهَا فِي قُبُلِ عِدَّتِهَا قَالَ قُلْتُ فَيُعْتَدُّ بِهَا قَالَ فَمَهْ أَرَأَيْتَ إِنْ عَجَزَ وَاسْتَحْمَقَ  

His father divorced his wife during her menses, so Umar asked the Prophet about that and he said: "Tell him to take her back, then let him divorce her while she is pure or pregnant."  

أَنَّهُ طَلَّقَ امْرَأَتَهُ فِي الْحَيْضِ فَسَأَلَ عُمَرُ النَّبِيَّ ﷺ فَقَالَ مُرْهُ فَلْيُرَاجِعْهَا ثُمَّ لْيُطَلِّقْهَا طَاهِرًا أَوْ حَامِلاً  

His father divorced his wife during her menses, so Umar asked the Prophet about that and he said: "Tell him to take her back, then let him divorce her while she is pure or pregnant." (Using translation from Tirmidhī 1176)  

أَنَّهُ طَلَّقَ امْرَأَتَهُ وَهِيَ حَائِضٌ فَسَأَلَ عُمَرُ النَّبِيَّ ﷺ فَقَالَ مُرْهُ فَلْيُرَاجِعْهَا ثُمَّ لِيُطَلِّقْهَا طَاهِرًا أَوْ حَامِلًا