Narrated 'Aisha:
One of the mothers of the faithful believers (i.e. the wives of the Prophet ) did l'tikaf while she was having bleeding in between her periods.
حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا مُعْتَمِرٌ، عَنْ خَالِدٍ، عَنْ عِكْرِمَةَ، عَنْ عَائِشَةَ، أَنَّ بَعْضَ، أُمَّهَاتِ الْمُؤْمِنِينَ اعْتَكَفَتْ وَهْىَ مُسْتَحَاضَةٌ.
• Sahih al-Bukhari, 311
• Sahih al-Bukhari, Vol. 1, Book of Menstrual Periods, Hadith 308
• Sahih al-Bukhari, Book of Menstrual Periods, Hadith 308