Abu Hurairah and Abu Sa'id Al-Khudri (May Allah be pleased with them) reported:
The Messenger of Allah ﷺ said, "When a group of people assemble for the remembrance of Allah, the angels surround them (with their wings), (Allah's) mercy envelops them, Sakinah, or tranquillity descends upon them and Allah makes a mention of them before those who are near Him."

[Muslim].

وعنه وعن أبي سعيد رضي الله عنهما قالا: قال رسول الله ﷺ: "لا يقعد قوم يذكرون الله عز وجل إلا حفتهم الملائكة، وغشيتهم الرحمة ونزلت عليهم السكينة، وذكرهم الله فيمن عنده" ((رواه مسلم)).