From Sahih Muslim (Hadith 6570):
Jabir b. Abdullah reported that Allah's Messenger (ﷺ) visited Umm Sa'ib or Umm Musayyib and said:Umm Sa'ib or Umm Musayyib. why is it that you are shivering? She said:" It is fever and may it not be blessed by Allah, whereupon he (the Holy Prophet) said: Don't curse fever for it expiates the sin of the children of Adam just as furnace removes the alloy of iron
Reference: Muslim 6570