Narrated from Sayyiduna Sahl bin Sa’d Sa’idi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Surely, the relationship of a believer with other people of faith is like the relationship of the head with the body. A believer feels pain for other believers just as the whole body feels pain due to an illness in the head.
Hadith Takhrij«صحيح لغيره، أخرجه الطبراني في الكبير : 5743، وفي الاوسط : 4693 ، (انظر مسند أحمد ترقيم الرسالة: 22877 ترقیم بيت الأفكار الدولية: 23265»