Sayyiduna Jundub bin Abdullah (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) say: "Listen! Whoever prays the Fajr prayer is under the protection of Allah, so let not Allah demand from you anything concerning His protection."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1646