Yes. Allah compares backbiting to eating the flesh of one's dead brother (49:12). The Prophet ﷺ explained that it is mentioning your brother in a way he dislikes.
Wahai orang-orang yang beriman! Jauhilah kebanyakan dari sangkaan (supaya kamu tidak menyangka sangkaan yang dilarang) kerana sesungguhnya sebahagian dari sangkaan itu adalah dosa; dan janganlah kamu mengintip atau mencari-cari kesalahan dan keaiban orang; dan janganlah setengah kamu mengumpat setengahnya yang lain. Adakah seseorang dari kamu suka memakan daging saudaranya yang telah mati? (Jika demikian keadaan mengumpat) maka sudah tentu kamu jijik kepadanya. (Oleh itu, patuhilah larangan-larangan yang tersebut) dan bertaqwalah kamu kepada Allah; sesungguhnya Allah Penerima taubat, lagi Maha mengasihani.
Hadith
Sahih Muslim 2589
Abu Huraira reported Allah's Messenger (ﷺ) as saying:Do you know what is backbiting? They (the Companions) said: Allah and His Messenger know best. Thereupon he (the Holy Prophet) said: Backbiting implies your talking about your brother in a manner which he does not like. It was said to him: What is your opinion about this that if I actually find (that failing) in my brother which I made a mention of? He said: If (that failing) is actually found (in him) what you assert, you in fact backbited him, and if that is not in him it is a slander
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is backbiting (gheebah) haram?
Yes. Allah compares backbiting to eating the flesh of one's dead brother (49:12). The Prophet ﷺ explained that it is mentioning your brother in a way he dislikes.
