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