صَحِيحُ مُسْلِمٍ
Sahih Muslim 2209 a
The Book of Greetings
For Every Disease There Is A Remedy, And It Is Recommended To Treat Disease
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 .
Ibn Umar reported Allah's Messenger (ﷺ) as saying: The fever from the vehement raging of the (heat of Hell), so cool it with the help of water.
Sahih Muslim, 2209 aSahihصحيح