Narrated Nazi': Abdullah bin 'Umar said, "The Prophet 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).
— Sahih Bukhari, Volume 7, Book 71: Medicine, Hadith #619
Narrated Nazi': Abdullah bin 'Umar said, "The Prophet 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).
This hadith is from the book of Medicine in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 619 in book 71 of volume 7.
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