(1)
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. (IT)
Reference (IT): Bulugh al-Maram 596 (IT)
In-book reference (IT): Book 3, Hadith 65 (IT)
English translation (IT): Book 3, Hadith 621 (IT)