Hadith 282
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.
Hadith 283
This tradition has also been transmitted by Zuhair through a different chain of narrators, to the same effect. He said: When the menstruation begins, you should abandon prayer; when the period equal to its length of time passes, you should wash away the blood and pray.