Mishkat al-Masabih #2173
Supplications
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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
He reported God's messenger as saying, "People who arise from an assembly in which they did not remember God will be just as if they had got up from an ass's corpse, and it will be a cause of grief to them."
Ahmad and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #2173 from Mishkat al-Masabih, in the Book of Supplications.