Bulugh al-Maram, Book 16, Hadith 1547 (English) ⓘ
A’ishah (RAA) narrated that the Messenger of Allah said: “Avoid reviling the dead, they have already seen the result of (the deeds) that they forwarded before them.” Related by Al-Bukhari.
وَعَنْ عَائِشَةَ -رَضِيَ اَللَّهُ عَنْهَا- قَالَتْ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ لَا تَسُبُّوا اَلْأَمْوَاتَ ; فَإِنَّهُمْ قَدْ أَفْضَوْا إِلَى مَا قَدَّمُوا } أَخْرَجَهُ اَلْبُخَارِيُّ. (1966). 1 - صحيح. رواه البخاري (1393).
also referenced under: Book 16, Hadith 1504 (In-Book)