Almighty Allãh condemned backbiting in His noble Book and has described it such that mind and body feel abhorrence towards it. He said, “And some of you should not backbite the others: would anyone of you like to eat the flesh of his dead brother? No, you abhor it.” (49:12)
The Prophet (s.a.w.) said, “Be careful of backbiting because backbiting is worse than adultery, in that a person who commits adultery can repent and ask forgiveness from God, and Allãh can forgive him whereas Allãh will not forgive the backbiter until the person who was at the receiving end forgives him.”43
It is not appropriate for a believer to listen to backbiting against his believing brother. Indeed, it appears from the sayings of the Prophet and the Imams (may Allãh bless them all) that it is obligatory upon one who hears backbiting to support the person who is being disparaged; and that if he does not repel the backbiting [against his believing brother], Allãh will abandon him in this world as well as in the hereafter, and he shall be held accountable just like the one who did the backbiting.