It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: The superiority of prayer in congregation over prayer offered alone is twenty-five degrees, and the angels of the night and the day gather at the time of Fajr prayer. Then Hazrat Abu Huraira (may Allah be pleased with him) said: If you wish, you may recite this verse in confirmation of it: "Indeed, the recitation of the Qur'an at Fajr is witnessed" , (the angels bear witness to it because they are present at that time).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7185