Abu Huraira reported: The Prophet, peace and blessings be upon him, said, Indeed, Allah Almighty has caravans of angels who have no other work but to follow gatherings of remembrance. When they find such gatherings in which there is remembrance, they sit with them and some of them surround the others with their wings until the space between them and the heavens is covered. When they disperse, they ascend to the heavens and Allah Almighty asks them, although He knows better than them:
From where have you come? They say: We came from Your servants on earth who were glorifying You, declaring Your greatness and oneness, praising You and asking from You.