Riyad as-Salihin, Book 5, Hadith 836 (In-Book) ⓘ

Abu Hurairah (May Allah be pleased with him) reported: The Prophet said, "Whenever a group of people sit in a gathering in which they do not remember Allah the Exalted, nor supplicate to elevate the rank of their Prophet, such a gathering will be a cause of grief to them. If Allah wills, He will punish them, and if He wills He will forgive them."[At-Tirmidhi].

وعنه عن النبي صلى الله عليه وسلم قال‏:‏ ‏ "‏ما جلس قوم مجلساً لم يذكروا الله تعالى فيه، ولم يصلوا على نبيهم فيه، إلا كان عليهم ترة؛ فإن شاء عذبهم، وإن شاء غفر لهم‏" ‏ ‏.‏