It is narrated from Sayyiduna Jundub bin Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever prays the morning prayer is under the protection of Allah. O son of Adam, beware! Lest Allah demand from you anything concerning His protection."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1644