It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Umm Habibah bint Jahsh (may Allah be pleased with her), who was the wife of Abd al-Rahman bin Awf (may Allah be pleased with him), complained to the Messenger of Allah (peace and blessings be upon him) about the bleeding. He (peace and blessings be upon him) said: "Remain for as long as your menstruation used to hold you back, then perform ghusl." The narrator said: She used to perform ghusl at the time of every prayer of her own accord. (b) In these two authentic narrations, the Prophet (peace and blessings be upon him) did not order her to perform ghusl for every prayer; she used to do this of her own accord. So how can the order to perform ghusl be established from the hadith of Urwah?
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1643