وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ، أَنَّهَا انْتَقَلَتْ حَفْصَةَ بِنْتَ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرٍ الصِّدِّيقِ حِينَ دَخَلَتْ فِي الدَّمِ مِنَ الْحَيْضَةِ الثَّالِثَةِ ‏.‏ قَالَ ابْنُ شِهَابٍ فَذُكِرَ ذَلِكَ لِعَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ فَقَالَتْ صَدَقَ عُرْوَةُ وَقَدْ جَادَلَهَا فِي ذَلِكَ نَاسٌ فَقَالُوا إِنَّ اللَّهَ تَبَارَكَ وَتَعَالَى يَقُولُ فِي كِتَابِهِ ‏{‏ثَلاَثَةَ قُرُوءٍ‏}‏ فَقَالَتْ عَائِشَةُ صَدَقْتُمْ تَدْرُونَ مَا الأَقْرَاءُ إِنَّمَا الأَقْرَاءُ الأَطْهَارُ ‏.‏

Yahya related to me from Malik from Ibn Shihab from Urwa ibn az-Zubayr from A'isha, umm al-muminin, that she took Hafsa ibn Abd ar-Rahman ibn Abi Bakr as-Siddiq into her house when she had entered thethird period of her idda. Ibn Shihab said, "That was mentioned to Amrabint Abd ar-Rahman, and she said that Urwa had spoken the truth andpeople had argued with A'isha about it. They said that Allah, theBlessed, the Exalted, said in His Book, 'Three quru.' A'isha said,'You spoke the truth. Do you know what quru are? Quru are times ofbecoming pure after menstruation .' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1215
Web Ref:  Muwatta Imam Malik Book 29 Hadith 54