Sayyiduna Abu Hurayrah (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) say: "Praying in congregation is twenty-five degrees more excellent than praying alone, and the angels of the night and the angels of the day gather at the Fajr prayer." Then Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: If you wish, recite: "And the recitation of dawn; indeed, the recitation of dawn is ever witnessed." [Surah al-Isra: 78]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1681