"Something bad was said in the presence of the Prophet about a person who had died. He said: 'Do not say anything but good about your dead."' (Using translation from Nasāʾī 1935)  

ذُكِرَ عِنْدَ النَّبِيِّ ﷺ هَالِكٌ بِسُوءٍ فَقَالَ «لَا تَذْكُرُوا هَلْكَاكُمْ إِلَّا بِخَيْرٍ»