(2) باب ذِكْرِ الاِسْتِحَاضَةِ وَإِقْبَالِ الدَّمِ وَإِدْبَارِهِ
It was narrated that 'Aishah said:
"Umm Habibah bint Jahsh asked the Messenger of Allah (ﷺ): 'O Messenger of Allah, I suffer from Istihadah.' He said: 'That is a vein, so perform Ghusl, then pray.' And she used to perform Ghusl for each prayer."
Reference: Sunan an-Nasa'i 351
In-book reference: Book 3, Hadith 4
English translation: Vol. 1, Book 3, Hadith 352