Getting Together To Eat Other People's Flesh

Question :

In our town, many young people spend entire nights together talking, most of which consists of backbiting and slandering. May I sit with these people in their gatherings?

Answer:

These people who get together are foolish, for in reality, they are getting together to eat the flesh of others; Allah Almighty says:
"And don't backbite one another. Would one of you like to eat the flesh of his dead brother? You would hate it (so hate back- biting)."

These people who gather to eat other people's flesh are perpetrating one of the greatest of sins; you must, therefore, advise them. If they heed your advice by refraining from backbiting, then that is well; if not, then you must leave their company, for Allâh Almighty says:
"And it has already been revealed to you in the Book (this Qur'an) that when you hear the Verses of Allah being denied and mocked at, then sit not with them, until they engage in a talk other than that; (but if you stayed with them) certainly in that case you would be like them. Surely, Allah will collect the hypocrites and disbelievers all together in Hell."

So those sitting with others who hear Allah's verses, disbelieving in them, and mocking them, fall under the same ruling as those doing that. This is one of the worst things that remove one from the religion, and it is the same for participating in a form of disobedience that is even of a lesser degree the one sitting where backbiting occurs is equal in sin to the one doing the backbiting. So you are required to leave their gatherings and not sit with them.

Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 8 Pages 292-293