Hadith 481:31
Asbat ibn Muhammad narrated to us, Hisham ibn Sa’d narrated to us, from Zayd ibn Aslam, from Mahmud ibn Labid, from some of the companions of the Prophet, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "Perform the dawn prayer when it is bright (isfiru), for it is greater in reward."
حدثنا أسباط بن محمد، حدثنا هشام بن سعد، عن زيد بن أسلم، عن محمود بن لبيد، عن بعض أصحاب النبي صلى الله عليه وسلم قال: قال رسول الله صلى الله عليه وسلم: " أسفروا بالفجر، فإنه أعظم للأجر "