Urwah reported on the authority of 'Aishah:Fatimah daughter of Abu Hubaish came to the Messenger of Allah (ﷺ) and said: I am a woman who has prolonged flow of blood; I am never purified ; should I abandon prayer ? He replied: This is (due to) a vein, and not menstruation. When the menstruation begins, you should abandon prayer ; when it is finished, you should wash away the blood and pray

English translation · Sunan Abu Dawud