Sahih Muslim 5753
صحيح مسلم#5753SahihIbn Umar reported Allah's Messenger (ﷺ) as saying:Fever is from the vehement raging of the fire of Hell, so extinguish it with water
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 39:107