It was narrated from 'Aishah that Fatimah bint Abi Hubaish suffered from Istihadah. The Messenger of Allah (ﷺ) said to her:
"Menstrual blood is blood that is black and recognizable, so if it is like that, then stop praying, and if it is otherwise, then perform Wudu' and pray." Abu 'Abdur-Rahman said: Others reported this Hadith, and none of them mentioned what Ibn 'Adi mentioned, and Allah knows best.
Reference: Sunan an-Nasa'i 363 In-book : Book 3, Hadith 15 English translation : Vol. 1, Book 3, Hadith 363
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