(28) باب الْحُمَّى مِنْ فَيْحِ جَهَنَّمَ
Narrated Nazi':
`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).
Reference: Sahih al-Bukhari 5723
In-book reference: Book 76, Hadith 38
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 71, Hadith 619