Hazrat Antarah narrates that I asked Hazrat Ibn Abbas (may Allah be pleased with them): Which deed is the most virtuous? He replied: Remembering Allah is a very great deed. And no group of people sits in a house, engaging in the recitation and teaching of the Book of Allah, and does not disperse, except that the angels shade them with their wings, and as long as they remain in that place, they are guests of Allah, until they become occupied with something else.