al-Walid bin Kathir al-Makhzumi الوليد بن كثير المخزومي · The Book on Purification

"It was said, 'O Allah's Messenger! Shall we use the water of Buda'ah well to perform ablution while it is a well in which menstruation rags, flesh of dogs and the putrid are dumped?" Allah's Messenger said: 'Indeed water is pure, nothing makes it impure.'"