Backbiting Results in Enmity

Question :

Some people may Allah Almighty guide them don't consider backbiting to be unlawful or even inappropri- ate. They argue that they are doing well to warn others about a person's faults. Shaykh, please clarify this issue - may Allah reward you well.

Answer:

A Backbiting is unlawful and it is one of the major sins regardless whether what you say about the person is true or whether it is false. When the Messenger of Allâh was asked to define backbiting, he said that it is when you say something about your brother that he would dislike. Then someone said, "What if what I say about my brother is true?" The Prophet ﷺ answered:
"If he really is as you say of him, you have backbitten him; if he is not as you say of him, then you have slandered him."

In another authentic Hadith, the Prophet informed us, that when he ascended to the heavens, he saw people whose nails were made of copper; they were scratching their faces and their chests. He asked about them and he was told that they were those who eat people's flesh and who attack people's honor. Allâh Almighty says:
"O you who believe! Avoid much suspicions, indeed some suspicions are sins. And spy not, neither backbite one another. Would one of you like to eat the flesh of his dead brother? You would hate it (so hate backbiting). And fear Allah. Verily, Allah is the One Why accepts repentance, Most Merciful."

It is obligatory upon every Muslim, male and female - to refrain from backbiting and to advise others to refrain from it as well. By doing so, one is obeying Allâh Almighty and His Messenger , protecting the honor of one's Muslim brothers. When people stop backbiting, our relationships with one another will improve, on a family level, a friendship level, and a social level; backbiting only serves to instill hatred and rancor between people. May Allah Almighty guide us to all that is good.

Source:
Ibn Baz
Fatawa Islamiyah, Vol. 8 Pages 285-286