Language:
كتاب بدء الخلق
59  
Beginning of Creation
(10)
Chapter: The description of the (Hell) Fire and the fact that it has already been created
(10)
باب صِفَةِ النَّارِ وَأَنَّهَا مَخْلُوقَةٌ
Sahih al-Bukhari 3264

Narrated Ibn `Umar:

The Prophet (ﷺ) said, "Fever is from the heat of the (Hell) Fire; so abate fever with water."

حَدَّثَنَا مُسَدَّدٌ، عَنْ يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ الْحُمَّى مِنْ فَيْحِ جَهَنَّمَ فَأَبْرِدُوهَا بِالْمَاءِ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3264
In-book reference : Book 59, Hadith 74
USC-MSA web (English) reference : Vol. 4, Book 54, Hadith 486
  (deprecated numbering scheme)