Yahya related to me from Malik, from Nafi, that Abdullah ibn Umarused to say, "A menstruating woman who wants to go into ihram to doeither hajj or umra can do so if she so wishes, but she cannot dotawaf of the House, nor the say between Safa and Marwa. She canparticipate in all the rituals along with everybody else, except thatshe cannot do tawaf of the House, nor the say between Safa and Marwa,nor can she come near the mosque until she is pure."
USC-MSA web (English) reference: Book 20, Hadith 55
Arabic reference: Book 20, Hadith 760