Silsilah as-Sahihah 274 — Mutual love and affection among believers

It is narrated from Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: “The importance of a believer to the people of faith is like the importance of the head to the body. A believer feels pain at the afflictions of the people of faith, just as the head feels pain from the illness of the body.”