"اِفْعَلِي مَا يَفْعَلُ اَلْحَاجُّ, غَيْرَ أَنْ لَا تَطُوفِي بِالْبَيْتِ حَتَّى تَطْهُرِي"
Narrated `A'ishah (RAA): When we came to a place called Sarif, I menstruated and the Prophet (Peace be upon him) told me, "You should perform all that a pilgrim would do, except circumambulation until you are pure (i.e. performed Ghusl)." [Reported by Al-Bukhari and Muslim and it is part of a long Hadith.]