A’ishah (RAA) narrated that the Messenger of Allah (ﷺ) 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.‏ [1]‏ .‏