Nu’man bin Bashir (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: “You will find the believers, in their mutual mercy, love, and kindness towards one another, like a single body; when one limb suffers, the whole body responds with wakefulness and fever.” Agreed upon.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 4953
Hadith Gradingالألبانی:مُتَّفق عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (6011) و مسلم (2586/66)»