Yahya related to me from Malik from AbuRijal Muhammad ibn Abd ar-Rahman from Amra bint Abd ar-Rahman that when A'isha umm al-mumininwas doing hajj with women who were expecting their periods, she wouldhurry them to do the tawaf al-ifada on the Day of Sacrifice. If theystarted to menstruate after the tawaf al-ifada she did not stop forthem but left with them while they were menstruating.
USC-MSA web (English) reference: Book 20, Hadith 236
Arabic reference: Book 20, Hadith 934