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Jabir b. Abdullah reported that Allah's Messenger (may peace be upon him) 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 sir of the posterity of Adam just as furnace removes the alloy of iron.