Hadith.5913 - The Messenger of Allah سبحانه وتعالى (peace be upon him and his family) said: "Insulting a believer is an act of disobedience, fighting him (a believer) is disbelief, consuming his flesh (backbiting) is a sin against Allah سبحانه وتعالى the Exalted, and the sanctity of his wealth is like the sanctity of his blood."