The woman suffering from chronic, non-menstrual bleeding (mustahādah) is required to make a fresh ablution for every prayer.

Hishām ibn ʿUrwah narrates from his father, from ʿĀʾishah, that Fāṭimah bint Abī Ḥubaysh came to the Prophet ﷺ and said, “Messenger of Allah, I bleed for one or even two whole months.” He replied, “That is not menstruation; it is only blood from a vein. When your period begins, stop praying, and when it ends, bathe to regain purity—then perform ablution before every prayer.”

Ṭaḥā (61) records it through Abū Ḥanīfah. Al-Bukhārī (1/264–265), al-Tirmidhī (1/217–219), and Dāraquṭnī (76) transmit it through Abū Muʿāwiyah; al-Tirmidhī graded it ḥasan ṣaḥīḥ. Ibn Ḥibbān, as cited in Nasb al-Rāyah (203), relates it through Abū Ḥamzah.

Muslim (180), Abū Dāwūd (44), al-Nasāʾī (64), Ibn Mājah (214), Mī (198), Ṭaḥā (62), Dāraquṭnī (76), and Aḥmad (4/84) also report it through various chains from Hishām, but without the words “then perform ablution before every prayer.” This is the wording found in al-Bukhārī and al-Tirmidhī, which led some scholars to regard the extra phrase as an interpolation; Ibn Ḥajar refuted that claim in Fatḥ al-Bārī.

Another route comes through ʿUrwah ibn al-Zubayr, related by Ibn Mājah (215), Ṭaḥā (61), Dāraquṭnī (78), and Aḥmad (6/42, 204, 262) via al-Aʿmash from Ḥabīb ibn Abī Thābit, from ʿUrwah. Ibn Mājah further added, from Ibn al-Zubayr, a similar wording: “Make ablution for every prayer even if the blood drips onto the mat.” The transmitters are those of the two Ṣaḥīḥs, though the chain is deemed interrupted between Ḥabīb and ʿUrwah.

There is also another chain that goes back to Fāṭimah