Narrated `Aisha: One of the wives of Allah's Apostle practiced I`tikaf with him while she ad bleeding in between her periods and she would see red (blood) or yellowish traces, and sometimes we put a tray beneath her when she offered the prayer.
Hadith Referenceصحيح البخاري / كتاب الاعتكاف / 2037
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة