Anas ibn Mālik (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "During my ascent to heaven, I passed by a group of people with copper nails scratching their faces and chests. I asked: 'O Jibrīl, who are these?' He replied: 'These are the ones who eat the flesh of people (by backbiting) and slander them.'"
Good hadith - Narrated by Abu Daoud - Narrated by Ahmad

Meaning of this Hadīth: When the Prophet (may Allah's peace and blessings be upon him) was taken up to heaven on the Night of Ascension, he came across a group of people who were scratching their bodies with their copper nails. He wondered at their state and asked Jibrīl: "Who are these people, and why are they doing this to themselves?" Jibrīl replied that those were the ones who used to backbite people and slander them.

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