Bukayr bin 'Abdullah bin al-Ashj بكير بن عبد الله بن الأشج · The Book of Purification

Fatimah bint Abi Hubaish came to the Messenger of Allah (ﷺ) and said: "I am a woman who suffers from Istihadah (non-menstrual vaginal bleeding) and I never become pure. Should I stop praying?" He said: "No, that is a vein, it is not menstruation. When you period comes, stop praying, and when it goes, wash the blood from yourself and pray."

"None of you should urinate into still water and then perform Ghusl from it."