Whenever a lady suffering from fever was brought to Asma' bint Abu Bakr, she used to invoke Allah for her and then sprinkle some water on her body, at the chest and say, "Allah's Messenger (ﷺ) used to order us to abate fever with water."
Sahih al-Bukhari Book 76, Hadith 39
← Previous Hadith `Abdullah bin `Umar said, "The Prophet (ﷺ) said, 'Fever is from the heat of Hell, so put it out (cool it) with water.' " Nafi` added: `Abdullah used to say, "O Allah! Relieve us from the punishment," (when he suffered from fever).

Sahih al-Bukhari Book 76, Hadith 38 Next Hadith → The Prophet (ﷺ) said, "Fever is from the heat of Hell, so abate fever with water."

Sahih al-Bukhari Book 76, Hadith 40