It is narrated from Ibn Umar (may Allah be pleased with them both) that he divorced his wife during the time of the Messenger of Allah (ﷺ) while she was menstruating. Umar (may Allah be pleased with him) said: I asked the Messenger of Allah (ﷺ) about this, so he (ﷺ) said: "Tell Ibn Umar to take his wife back, then keep her in his marriage until she becomes pure from her menstruation. Then she should menstruate again and then become pure. Then, if he wishes, he may keep his wife in marriage, and if he wishes, he may divorce her before having intercourse with her. This is the prescribed period of purity in which Allah has commanded the women to be divorced."
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1238
Hadith Takhrijاخرجه البخاري ،الطلاق، باب وقول الله تعالى ﴿يايها النبى اذا .....﴾ (5251) ومسلم، الطلاق، باب تحريم طلاق الحائض بغير رضاها ..... الخ (1471)۔
Abu Zubair narrated that Abdur Rahman bin Aiman, the freed slave of Azza, was asking Abdullah bin Umar (may Allah be pleased with them both), and Abu Zubair was listening. He asked: "What is your opinion about a man who divorces his wife while she is menstruating?" Ibn Umar (may Allah be pleased with them both) replied that Abdullah bin Umar (i.e., he himself) had divorced his wife during her menstruation, so the Prophet (ﷺ) said: "Tell him (Ibn Umar) to take his wife back, and when she becomes pure from her menstruation, then if he wishes, he may divorce her or keep her in marriage." Ibn Umar (may Allah be pleased with them both) said, Allah the Exalted has said: "O Prophet! When you divorce women, divorce them at the commencement of their waiting period." Imam Shafi'i (may Allah have mercy on him) was uncertain in «في قُبل عدتهن» and «لقبل عدتهن».
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1239
Hadith Takhrijاخرجه مسلم ،الطلاق، باب تحريم طلاق الحائض بغير رضاها ، وأنه لو خاف ...... الخ (1471)۔
It is narrated from Mujahid (may Allah have mercy on him) that he also used to recite «فطلقوهن لعدتهن» as «في قبل عدتهن».
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1240
Hadith Takhrijاسناده ضعيف لعنعنة ابن جريج - اخرجه البيهقي : 7/ 323- وفي المعرفة السنن والآثار له (4410)۔ وعبد الرزاق في تفسيره: 3-315 والطبري في تفسيره: (28/ 130)۔
It is narrated from Abdullah bin Umar (may Allah be pleased with them both) that he used to recite in this manner: «اذا طلقتم النساء فطلقوهن لقبل عدتهن».
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1241
Hadith Takhrijصحيح اخرجه البيهقي : 323/7 - وفى المعرفة السنن والآثار له (4411)۔
Abu Zubair narrated that he heard Abdullah bin Ayman asking Ibn Umar (may Allah be pleased with them both), and Abu Zubair was listening: "What is your opinion about a man who divorces his wife while she is menstruating?" He replied that during the time of the Prophet ﷺ, Abdullah bin Umar (may Allah be pleased with them both) divorced his wife while she was menstruating. When Umar (may Allah be pleased with him) asked the Messenger of Allah ﷺ about this, the Messenger of Allah ﷺ said: "Tell Ibn Umar to take her back." She was returned to me and it was not considered a problem, and he said: "When she becomes pure from her menstruation, then if you wish, divorce her or keep her in marriage."
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1242
It is narrated from Ibn Umar (may Allah be pleased with them both) that he divorced his wife during her menstruation in the time of the Prophet ﷺ. When Umar (may Allah be pleased with him) asked the Messenger of Allah ﷺ about this, the Messenger of Allah ﷺ said: "Order Ibn Umar to take her back." The Prophet ﷺ returned the woman to me without any objection, and said: "When she becomes pure from her menstruation, then he may divorce her or keep her in his marriage."
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1243
It is narrated from Ibn Umar (may Allah be pleased with them both) that he divorced his wife during her menstrual period in the time of the Prophet ﷺ. When Umar (may Allah be pleased with him) asked the Messenger of Allah ﷺ about this, the Messenger of Allah ﷺ said: "Tell Ibn Umar to take her back, then keep her with him until she becomes pure from her menstruation, then she has her menses again, and when she becomes pure after that, if he wishes, he may keep her in his marriage, and if he wishes, he may divorce her before having intercourse with her in that period of purity. This is the waiting period in which Allah has commanded women to be divorced."
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1244
It is narrated from Ibn Jurayj that he sent a man to Nafi‘ (may Allah have mercy on him) to ask whether, in the time of the Prophet ﷺ, the divorce given by Ibn ‘Umar (may Allah be pleased with him) was counted. He replied: "Yes."
Hadith Referenceمسند الإمام الشافعي / كتاب الطلاق / 1245
Hadith Takhrijاسناده ضعيف لإرساله وعدم تصريح ابن جريج بالسماع من نافع - اخرجه البيهقي : 324/7- وفي المعرفة السنن والآثار له (4414)۔