The Book of Greetings
39/26. Chapter:
For Every Disease There Is A Remedy, And It Is Recommended To Treat Disease
Sahih Muslim
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَأَبُو كُرَيْبٍ قَالاَ حَدَّثَنَا ابْنُ نُمَيْرٍ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الْحُمَّى مِنْ فَيْحِ جَهَنَّمَ فَابْرُدُوهَا بِالْمَاءِ " .
'A'isha reported Allah's messenger (ﷺ) as saying: Fever is from the vehement raging of the Hell-fire, so cool it with water.
Reference : Sahih Muslim 2210aIn-book reference : Book 39, Hadith 109USC-MSA web (English) reference : Book 26, Hadith 5480