Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: When my Lord took me on the Night Journey (Mi'raj), I passed by some people who had copper nails and were scratching their faces and chests with them. I said: O Jibril! Who are these people? He said: These are the people who used to eat the flesh of others and would attack their honor (i.e., they used to indulge in slander and backbiting).