عن رافع بن خديج رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : «أَصْبِحُوا بالصبح؛ فإنه أعظم لِأُجُورِكُم، أو أعظم للأجر».
Rāfi‘ ibn Khadeīj (may Allah be pleased with him) reported: The Messenger of Allah (may Allah’s peace and blessings be upon him) said: "Offer the Fajr prayer at dawn, for this earns you greater rewards – or brings greater rewards."
The Prophet (may Allah's peace and blessings be upon him) ordered that we should perform the Fajr prayer after the break of dawn, explaining that this is greater in reward, given the certainty that the time of the Fajr prayer has come.