حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ أَنَسِ بْنِ سِيرِينَ أَنَّهُ سَمِعَ ابْنَ عُمَرَ قَالَ طَلَّقْتُ امْرَأَتِي وَهِيَ حَائِضٌ فَأَتَى عُمَرُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَخْبَرَهُ فَقَالَ مُرْهُ فَلْيُرَاجِعْهَا ثُمَّ إِذَا طَهُرَتْ فَلْيُطَلِّقْهَا قُلْتُ لِابْنِ عُمَرَ أَحَسِبَ تِلْكَ التَّطْلِيقَةَ قَالَ فَمَهْ
مسند امام احمد بن حنبل · Hadith 5489
It was narrated from Anas ibn Sireen that he heard Ibn 'Umar say: I divorced my wife when she was menstruating. 'Umar went to the Prophet (PBUH) and told him (about that) and he said: "Tell him to take her back, then when she becomes pure let him divorce her." I said to Ibn 'Umar: Did it count as a divorce? He said: of course.
Sanad
حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ أَنَسِ بْنِ سِيرِينَ أَنَّهُ سَمِعَ ابْنَ عُمَرَ