Nu'man b. Bashir reported that Muslims are like one body of a person; if the eye is sore, the whole body aches, and if the head aches, the whole body aches.
Sahih Muslim Book 45, Hadith 87
← Previous Hadith The believers are like one person; if his head aches, the whole body aches with fever and sleeplessness.

Sahih Muslim Book 45, Hadith 86 Next Hadith → A hadith like this has been narrated on the authority of Nu'man b. Bashir through another chain of transmitters.

Sahih Muslim Book 45, Hadith 88