hadith
9561
۞
Imam Ali (AS) said, Do not remember the dead negatively [by recalling their bad actions] for this suffices as a sin.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : لاتَذْكُرِ المَوْتى بِسُوء فَكَفى بِذلِكَ إثْماً