The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wa'l-Adab)

Muslim :: Book 32 : Hadith 6260

Nu'man b. Bashir reported Allah's Messenger (may peace be upon him) as saying: The believers are like one person; if his head aches, the whole body aches with fever and sleeplessness.