Musnad Ahmad 1283:2

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from 'Amrah, from Umm Habibah bint Jahsh, who said: I suffered from *istihada* (prolonged non-menstrual bleeding) for seven years, so I complained about that to the Messenger of Allah, peace and blessings of Allah be upon him. The Prophet, peace and blessings of Allah be upon him, said: "That is not the menstruation, but rather a vein, so perform *ghusl* (ritual bath)." She used to perform *ghusl* for every prayer, and she would perform *ghusl* in a large basin, and she would see the yellowness of the blood in the basin.