Sayyiduna Abdullah bin Amr (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whenever some people sit in a gathering and do not remember Allah Almighty in it, on the Day of Resurrection they will see that gathering as a cause of regret."
Ahmad recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأذكار / 16788
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«اخرجه احمد فى المسند (7093) ، أخرجه مسند أحمد برقم: 7053»