The holy Prophet of Islam (PBUH) warned about the dangers of discrediting others and said:

Anyone who takes steps to reproach and reveal the secrets of his brother in religion, his/her first step will be to enter the hell; and Allah (SWT) will reveal that person’s secrets and faults for all the people [1]. In another narration, the holy Prophet (PBUH) said: O’ people, shedding each other’s blood and damaging others reputation (discrediting others) is Haram until the time of your death (forever) [2].

[1] La’aalial Akhbar, Vol. 5, Page 241.

[2] Tohaful Oqool, page 31.

Source: en.shafaqna.com