(26) باب لِكُلِّ دَاءٍ دَوَاءٌ وَاسْتِحْبَابُ التَّدَاوِي
Asma' reported that a woman running high fever was brought to her. She asked water to be brought and then sprinkled it in the opening of a shirt at the uppermost part of the chest and said that Allah's Messenger (ﷺ) had said:
Cool (the fever) with water. for it is because of the vehemence of the beat of Hell.
Reference: Sahih Muslim 2211 a
In-book reference: Book 39, Hadith 111
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5482