Mishkat al-Masabih
Mishkat al-Masabih 2273
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا مِنْ قَوْمٍ يَقُومُونَ مِنْ مَجْلِسٍ لَا يَذْكُرُونَ اللَّهَ فِيهِ إِلَّا قَامُوا عَنْ مِثْلِ جِيفَةِ حِمَارٍ وَكَانَ عَلَيْهِمْ حَسرَةً» . رَوَاهُ أحمدُ وَأَبُو دَاوُد
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Abu Hurayrah reported that the Messenger of God (peace be upon him) said: ‘No people leave a gathering in which they did not remember God without leaving like those who have departed from a donkey’s carcass, and it will be a source of regret for them.’ Ahmad and Abu Dawud transmitted it. The Arabic source grades it sahih (al-Albani).
Notes and open questions — unreviewed
The vivid comparison to a donkey’s carcass is translated literally.