Hadith 482

A’ishah (RAA) narrated that the Messenger of Allah (ﷺ) said: “Do not speak badly of the dead, they have already seen the result of (the deeds) that they sent on before them.” Related by Al·Bukhari. At-Tirmidhi Related a similar narration on the authority of Al-Mughirah bin Shu’bah, and he added, "Thus you will be offending the living (i.e. if you curse their dead)."