1726/1 - Jābir (may Allah be pleased with him) reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) visited Umm al-Sā’ib or Umm al-Musayyab and said: “Why are you shivering, O Umm al-Sā’ib - or Umm al-Musayyab?” She said: “It is fever, may it not be blessed by Allah.” Thereupon, he said: “Do not curse the fever, for it removes the sins of the children of Adam the same way the bellows remove the impurities of iron.” [Narrated by Muslim]
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Fever is a symptom of high temperature that accompanies numerous illnesses.
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1) When a person suffers fever or other forms of illness, he should be patient and expect the reward from his Lord, as illnesses expiate sins.
2) It urges us to rectify the words people use in their speech in accordance with the Shariah. This falls under commanding the good and forbidding the evil.