Sahih Muslim Book - 18, Hadith - 3654

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ حَدَّثَنَا أَبِى حَدَّثَنَا عُبَيْدُ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ طَلَّقْتُ امْرَأَتِى عَلَى عَهْدِ رَسُولِ اللَّهِ -صلى الله عليه وسلم- وَهْىَ حَائِضٌ فَذَكَرَ ذَلِكَ عُمَرُ لِرَسُولِ اللَّهِ -صلى الله عليه وسلم- فَقَالَ « مُرْهُ فَلْيُرَاجِعْهَا ثُمَّ لْيَدَعْهَا حَتَّى تَطْهُرَ ثُمَّ تَحِيضَ حَيْضَةً أُخْرَى فَإِذَا طَهُرَتْ فَلْيُطَلِّقْهَا قَبْلَ أَنْ يُجَامِعَهَا أَوْ يُمْسِكْهَا فَإِنَّهَا الْعِدَّةُ الَّتِى أَمَرَ اللَّهُ أَنْ يُطَلَّقَ لَهَا النِّسَاءُ ». قَالَ عُبَيْدُ اللَّهِ قُلْتُ لِنَافِعٍ مَا صَنَعَتِ التَّطْلِيقَةُ قَالَ وَاحِدَةٌ اعْتَدَّ بِهَا.

It was narrated that Ibn 'Umar said: "I divorced my wife at the time of the Messenger of Allah (s.a.w) while she was menstruating. 'Umar mentioned that to the Messenger of Allah (s.a.w) and he said: 'Tell him to take her back, then let him wait until she becomes pure, then menstruates again, then when she becomes pure again, let him divorce her before having intercourse with her, or let him keep her. That is the 'Iddah (prescribed periods) for which Allah has enjoined the divorce of women."' 'Ubaidullah said: "I said to Nafi': 'What happened to that divorce?' He said: 'It was one divorce that was counted as such."'