Sunan Ibn Majah, Book 10, Hadith 2100 (In-Book) ⓘ

It was narrated that Yunus bin Jubair, Abu Ghallab, said: "I asked Ibn 'Umar about a man who divorced his wife when she was menstruating. He said: 'Do you know 'Abdullah bin 'Umar? He divorced his wife when she was menstruating then 'Umar came to the Prophet (and told him what had happened). He ordered him to take her back.' I said: 'Will that be counted (as a divorce)?' He said: 'Do You think he was helpless and behaving foolishly? [i.e., Yes, it counts (as a divorce).]."'

حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا هِشَامٌ، عَنْ مُحَمَّدٍ، عَنْ يُونُسَ بْنِ جُبَيْرٍ أَبِي غَلاَّبٍ، قَالَ سَأَلْتُ ابْنَ عُمَرَ عَنْ رَجُلٍ، طَلَّقَ امْرَأَتَهُ وَهِيَ حَائِضٌ فَقَالَ تَعْرِفُ عَبْدَ اللَّهِ بْنَ عُمَرَ طَلَّقَ امْرَأَتَهُ وَهِيَ حَائِضٌ فَأَتَى عُمَرُ النَّبِيَّ ـ صلى الله عليه وسلم ـ فَأَمَرَهُ أَنْ يُرَاجِعَهَا ‏.‏ قُلْتُ أَيُعْتَدُّ بِتِلْكَ قَالَ أَرَأَيْتَ إِنْ عَجَزَ وَاسْتَحْمَقَ