It is narrated from Sayyida Aisha (may Allah be pleased with her) that she said: When Hafsa bint Abdur Rahman entered her third menstrual period, she changed her residence. Ibn Shihab (may Allah have mercy on him) said: I mentioned this matter to Amrah bint Abdur Rahman, and she said: "Urwah has spoken the truth. In fact, people objected to Aisha (may Allah be pleased with her), saying: Allah Almighty says: 'Divorced women shall keep themselves in waiting for three periods (__QUR_N__),' so Aisha (may Allah be pleased with her) said: You have spoken the truth. Do you know what is meant by 'qurūʼ'? 'Qurūʼ' means purity."
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1288
Hadith Takhrijاسناده صحیح اخرجه البيهقي : 415/7 - وفى المعرفة السنن والآثار له (4604)۔ وعبد الرزاق (11004)۔ ومالك في الموطأ الطلاق، باب ما جاء في الاقراء وعدة الطلاق وطلاق الحائض۔
Abu Bakr bin Abdur Rahman narrates: I found all the jurists saying the same thing that Aisha (may Allah be pleased with her) said, (that "qur’" means purity).
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1289
Hadith Takhrijاسناده صحيح أخرجه البيهقي : 7 /415 ـ وفي المعرفة السنن والآثار له (4605) - وعبد الرزاق (11005)۔ بن أبي شيبة (18885) - والطحاوى في شرح المعاني : (61/3)۔
It is narrated from Aisha (may Allah be pleased with her) that she said: "When a divorced woman begins to experience the blood of her third menstruation, she has completed her waiting period ('iddah) from her husband."
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1290
Hadith Takhrijاسناده صحیح اخرجه البيهقى فى المعرفة السنن والآثار (4606)۔
Sulaiman bin Yasar (may Allah have mercy on him) narrates that Ahwas's wife entered her third menstrual period, and Ahwas passed away in Syria. He had divorced his wife. Muawiyah (may Allah be pleased with him) wrote a letter to Zaid bin Thabit (may Allah be pleased with him) and asked him about the issue. Zaid (may Allah be pleased with him) replied in writing: "When she entered the blood of the third menstruation, she and her husband were free from each other; they can no longer inherit from one another."
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1291
Hadith Takhrijاسناده صحیح اخرجه البيهقي: 7/415 - وفي المعرفة السنن والآثار له (4607) وعبد الرزاق (11006)، (11008) وابن ابی شیبة (18992)۔
Zaid bin Thabit (may Allah be pleased with him) stated that when a divorced woman begins her third menstrual period, she completes her waiting period (iddah).
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1292
Hadith Takhrijاسناده صحیح اخرجه البيهقي : 415/7 - وفى المعرفة السنن والآثار له (4608) - وعبد الرزاق (11003)۔ وابن ابي شيبة (18883) ۔ (1888)۔
It is narrated from Nafi‘ that Ibn ‘Umar (may Allah be pleased with them) said: "When a man divorces his wife and she enters into her third menstrual period, then this woman becomes separated from her husband and he from her. Neither will she inherit from him, nor will he inherit from her."
Hadith Referenceمسند الإمام الشافعي / كتاب العدد والسكنى والنفقات / 1293
Hadith Takhrijاسناده صحیح اخرجه البيهقي : 415/7 - وفى المعرفة السنن والآثار له (5609) - وعبد الرزاق (11004)۔ وابن ابي شيبة (18886) - ومالك فى الموطأ الطلاق، باب ما جاء فى الاقراء وعدة الطلاق وطلاق الحائض۔