Chapter 1: The Book of Purification
It was narrated that 'Aishah said: "Umm Habibah bint Jahsh consulted the Messenger of Allah (ﷺ) and said: 'O Messenger of Allah, I suffer from Istihadah (non-menstrual vaginal bleeding).' He said: 'That is a vein, so perform Ghusl and pray.' And she used to perform Ghusl for every prayer."
Sunan an-Nasa'i 206