Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:2477aʿAlī b. Muḥammad > Wakīʿ > Sufyān > Manṣūr > Ibrāhīm > al-Aswad > ʿĀʾishah > Umirat Barīrah

"Barirah was told to observe the waiting period for three menstrual cycles."  

ابن ماجة:٢٤٧٧aحَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ حَدَّثَنَا وَكِيعٌ عَنْ سُفْيَانَ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ عَنِ الأَسْوَدِ عَنْ عَائِشَةَ قَالَتْ أُمِرَتْ بَرِيرَةُ

أَنْ تَعْتَدَّ بِثَلاَثِ حِيَضٍ