564 - Ishaq narrated to us, saying: 'Abdah ibn Sulayman and Waki' informed us, both saying: Hisham ibn 'Urwah narrated to us, from his father, who said: Fatimah bint Abi Hubaysh came to the Messenger of Allah, may Allah bless him and grant him peace, and said: O Messenger of Allah, I experience irregular bleeding (istihada) and do not become pure; should I abandon prayer? He said: "No, that is merely a vein, and it is not menstruation. When menstruation approaches, leave off prayer, and when it departs, wash away the blood and pray."

565 - And I heard Ishaq saying: 'Abd al-Rahman ibn Mahdi said: "As for what we rely upon, and the best of what we have heard regarding the woman experiencing istihada, it is that she sits for the longest duration she used to sit, then performs ghusl and prays. If the blood stops after that for a day or two, it is more beloved to me that she perform another ghusl, because I do not know—perhaps her menstruation has changed. Praying while she is in doubt regarding her menstruation is more beloved to me than leaving prayer based on speculation, for she might be pure. In our view, this is based on the statement of the Messenger of Allah, may Allah bless him and grant him peace, when he saw her in a state of istihada. If the blood continues, and she sees it the second time in the same manner, then it is changed menstruation, and she should refrain from prayer during it, because women's menstruation increases and decreases. When she returns to her original state, 282 that which was in excess is istihada."