Sahih Muslim Book 45, Hadith 86

The believers are like one person; if his head aches, the whole body aches with fever and sleeplessness.

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Nu'man b. Bashir reported a hadith like this from Allah's Apostle (ﷺ).

Sahih Muslim Book 45, Hadith 85
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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