It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Umm Habibah (may Allah be pleased with her), who was the wife of Abd al-Rahman bin Awf (may Allah be pleased with him), had istihadah for seven years. The Messenger of Allah (peace and blessings be upon him) said: "This is not menstruation; rather, it is a vein, so perform ghusl."
In the hadith of Harmalah: she asked the Messenger of Allah (peace and blessings be upon him) about it, and the Messenger of Allah (peace and blessings be upon him) said: "This is not menstruation; rather, it is a vein, so perform ghusl and pray." Sayyidah Aishah (may Allah be pleased with her) said: She used to perform ghusl for every prayer in a tub in the room of her sister, Zaynab bint Jahsh (may Allah be pleased with her), until the redness of the blood rose above the water. Ibn Shihab said: We narrated that to Abu Bakr bin Abd al-Rahman bin al-Harith bin Hisham, and he said: May Allah have mercy on Hind; if only she had heard this fatwa! By Allah, she used to weep because she would not pray.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1637