Hadithcore
Hadith #2118590

Abu Hurairah (RAA) narrated that the Messenger of Allah (ﷺ) said:

“If people sit in an assembly in which they do not remember Allah or invoke blessings on the Prophet (ﷺ) it will be a cause of grief to them on the Day of Resurrection.” Related by At-Tirmidhi who graded it as Hasan.

وَعَنْهُ قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ مَا قَعَدَ قَوْمٌ مَقْعَدًا لَمْ يَذْكُرُوا اَللَّهَ, وَلَمْ يُصَلُّوا عَلَى اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-إِلَّا كَانَ عَلَيْهِمْ حَسْرَةً يَوْمَ اَلْقِيَامَةِ } أَخْرَجَهُ اَلتِّرْمِذِيُّ, وَقَالَ:

حَسَنٌ

.‏ [1]‏ .‏

References2 variants
Sunnah.com reference
Book 16, Hadith 105
Arabic/English book reference
Book 16, Hadith 1584