It is narrated from Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him), he says: Whoever, in whose presence a believer is backbitten and he helps him, Allah Almighty will reward him in this world and the Hereafter. And whoever, in whose presence a Muslim is backbitten and he does not help him, that is, does not defend him, Allah Almighty will give him an evil recompense in this world and the Hereafter. And no one has put a worse morsel in his mouth than backbiting a believer. If he says something about him which he knows, then he has backbitten him, and if he says something about him which he does not know, then he has slandered him.