(26) باب عِرْقِ الاِسْتِحَاضَةِ
Narrated `Aisha:
(the wife of the Prophet) Um Habiba got bleeding in between the periods for seven years. She asked Allah's Messenger (ﷺ) about it. He ordered her to take a bath (after the termination of actual periods) and added that it was (from) a blood vessel. So she used to take a bath for every prayer.
Reference: Sahih al-Bukhari 327
In-book reference: Book 6, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 6, Hadith 324