From Sahih Bukhari (Hadith 5724):
Narrated Fatima bint Al-Mundhir: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
Reference: Bukhari 5724