Abu Ubaydah (may Allah be pleased with him) narrates: Sayyiduna Abdullah (may Allah be pleased with him) used to say: The angels appointed by Allah Almighty come one after another; the guardians of the night come, and the guardians of the day come, at the time of true dawn. If you wish, recite (in support of this) this verse: "And the recitation at Fajr; indeed, the recitation at Fajr is witnessed."
Imam al-Tabarani recorded it, and the narrator Abu Ubaydah did not hear from his father (Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him)).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1790