Knowledge
مَا اجْتَمَعَ قَوْمٌ فِي بَيْتٍ مِنْ بُيُوتِ اللَّهِ، يَتْلُونَ كِتَابَ اللَّهِ، وَيَتَدَارَسُونَهُ بَيْنَهُمْ، إِلَّا نَزَلَتْ عَلَيْهِمُ السَّكِينَةُ، وَغَشِيَتْهُمُ الرَّحْمَةُ، وَحَفَّتْهُمُ الْمَلَائِكَةُ، وَذَكَرَهُمُ اللَّهُ فِيمَنْ عِنْدَهُ
Translation
No group of people gather in a house of Allah, reciting the Book of Allah and studying it among themselves, except that tranquility descends upon them, mercy covers them, angels surround them, and Allah mentions them to those who are with Him.
Narrator
Abu Hurairah
Source
Sahih Muslim
Muslim 2699