Hadith #5501 (Sahih al-Bukhari)
Book: Medicine
Narrator(s): Nafie' نافع مولى ابن عمر
Grade: Sahih

`Abdullah bin `Umar said, “The Prophet (ﷺ) said, ‘Fever is from the heat of Hell, so put it out (cool it) with water.’ ” Nafi` added: `Abdullah used to say, “O Allah! Relieve us from the punishment,” (when he suffered from fever).

Source: https://parallelquran.com/hadith/sahih-al-bukhari-5501/