I heard the Prophet (ﷺ) saying, "Fever is from the heat of the (Hell) Fire; so cool it with water."
Sahih al-Bukhari Book 59, Hadith 72
← Previous Hadith I used to sit with Ibn `Abbas in Mecca. Once I had a fever and he said (to me), "Cool your fever with Zamzam water, for Allah's Messenger (ﷺ) said: 'It, (the Fever) is from the heat of the (Hell) Fire; so, cool it with water (or Zamzam water).

Sahih al-Bukhari Book 59, Hadith 71 Next Hadith → The Prophet (ﷺ) said, "Fever is from the heat of the (Hell) Fire, so cool it with water."

Sahih al-Bukhari Book 59, Hadith 73