Chapter 1: Purification (Kitab Al-Taharah)
' Urwah b. al-Zubair said the Fatimah daughter of Abu Hubaish had a prolonged flow of blood. The Prophet (ﷺ) said to her: When the blood of menses comes, it is black blood with can be recognized; so when that comes, refrain from prayer, but when a different type comes, perform ablution and pray. Abu Dawud said: Ibn al-Muthanna said: Ibn 'Adi narrated this tradition from his memory on the authority of 'Urwah from 'Aishah. Abu Dawud said: This tradition has also been transmitted by al-' Ala b. al-Musayyab and Shu' bah from al-Hakam on the authority of Abu Ja' far. Al-' Ala reported it as a statement of the Prophet (ﷺ), and Shu' bah as a statement of Abu Ja' far, saying: She should perform ablution for every prayer.
Sunan Abi Dawud 304