Hadith

Jabir (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) visited Umm Sa'ib (or Umm Musaiyyab) and asked her, "What ails you O Umm Sa'ib (or Umm Musaiyyab)? You are shivering.'' She replied: "It is a fever, may Allah not bless it!'' He said to her, "Do not revile fever, for it cleanses out the sins of the sons of Adam in the same way that a furnace removes the dirt of iron.''
[Muslim].        (2).    Rasul Allah, sal Allah alayhi wa sallam, said "Anyone who believes in Allah and the Last Day (of Judgment) should not harm his neighbor. Anyone who believes in Allah and the Last Day should host his guest generously. And anyone who believes in Allah and the Last Day should say what is good or keep quiet."
(Sahih Al-Bukhari)   (3).  224. Nu`man bin Bashir (May Allah be pleased with them) reported: Messenger of Allah (PBUH) said, "The believers in their mutual kindness, compassion and sympathy are just like one body. When one of the limbs suffers, the whole body responds to it with wakefulness and fever".
[Al-Bukhari and Muslim]. (4 ).