Sayyiduna Sahl bin Sa'd al-Sa'idi (may Allah be pleased with him) reports this saying of the Prophet (peace and blessings be upon him): "Among the people of faith, the believer is like the head in relation to the body. The believer feels pain for the people of faith just as the body feels pain because of the pain in the head."
Ahmad recorded it, and al-Tabarani in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat; the narrators of Ahmad are the narrators of the Sahih.
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (5743) أخرجه الطبراني فى المعجم الصغير (340/5) ، أخرجه مسند أحمد برقم: 22370، وأخرجه المعجم الكبير للطبراني برقم: 5743»
Sayyiduna Bashir bin Sa'd (may Allah be pleased with him), who was a Companion of the Prophet (peace and blessings be upon him), narrated: the Prophet (peace and blessings be upon him) said: "The position of one believer in relation to another believer is like the position of the head in relation to the body. When the body is in pain, the head also feels pain because of it, and when the head is in pain, the whole body feels pain."
Al-Tabarani recorded it; its chain contains a narrator, Abdullah al-Madini, who is matruk (abandoned).
Sayyiduna Abu Hurayrah (may Allah be pleased with him) and Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) report this saying of the Prophet (peace and blessings be upon him): "A believer to another believer is like a building, one part of which strengthens the other."
Al-Tabarani recorded it in al-Mu'jam al-Awsat; its chain contains a narrator, Salih bin Nabhan, who is da'if (weak).