Sahih Muslim , Book 39, Hadith 105 (In-Book) ⓘ
Ibn Umar reported Allah's Messenger as saying: The fever from the vehement raging of the (heat of Hell), so cool it with the help of water.
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، وَمُحَمَّدُ بْنُ الْمُثَنَّى، قَالاَ حَدَّثَنَا يَحْيَى، - وَهُوَ ابْنُ سَعِيدٍ - عَنْ عُبَيْدِ اللَّهِ، أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " الْحُمَّى مِنْ فَيْحِ جَهَنَّمَ فَابْرُدُوهَا بِالْمَاءِ " .
also referenced under: Hadith 2209 (Reference) & Book 26, Hadith 5476 (USC-MSA)