Imâm
an-Nawawee رحمه
الله said in his
Riyaadh-us-Saaliheen, chapter 256: “You should know
that backbiting is permissible for specific legislated reasons unreachable
except by (way of backbiting) they are the following six reasons:
1.
The first is complaining
of oppression, so it is permissible for the oppressed person to
present his case to the Muslim ruler or Muslim judge or someone of similar
stature and authority to assist in removing the oppression. He can say: “I
have been wronged by such and such a person.”
2.
The second is seeking
assistance in changing evil (munkar) and refuting the disobedient until they
return to what is correct. So one can say to the one who has
the ability to change the evil: “Such and such a person has done this, so
advise him.” Or something similar and that he intends to reach this
disobedient one by way of removing the evil, so if he intends other than that
then it is not permissible.