Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:1542 – ʿUbaydullāh b. Saʿīd > Yaḥyá > Ibn ʿAjlān > ʿĀṣim b. ʿUmar b. Qatādah > Maḥmūd b. Labīd > Rāfiʿ b. Khadīj

"Pray Fajr when the dawn shines." (Using translation from Nasāʾī 548)   

الكبرى للنسائي:١٥٤٢ – أَخْبَرَنَا عُبَيْدُ اللهِ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا يَحْيَى عَنِ ابْنِ عَجْلَانَ قَالَ حَدَّثَنِي عَاصِمُ بْنُ عُمَرَ بْنِ قَتَادَةَ عَنْ مَحْمُودِ بْنِ لَبِيدٍ عَنْ رَافِعِ بْنِ خَدِيجٍ

عَنِ النَّبِيِّ ﷺ «أَسْفِرُوا بِالْفَجْرِ»  

See similar narrations below:

Collected by Nasāʾī, Suyūṭī
nasai:548 – ʿUbaydullāh b. Saʿīd > Yaḥyá > Ibn ʿAjlān > ʿĀṣim b. ʿUmar b. Qatādah > Maḥmūd b. Labīd > Rāfiʿ b. Khadīj

"Pray Fajr when the dawn shines."  

النسائي:٥٤٨ – أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا يَحْيَى عَنِ ابْنِ عَجْلاَنَ قَالَ حَدَّثَنِي عَاصِمُ بْنُ عُمَرَ بْنِ قَتَادَةَ عَنْ مَحْمُودِ بْنِ لَبِيدٍ عَنْ رَافِعِ بْنِ خَدِيجٍ

عَنِ النَّبِيِّ ﷺ قَالَ أَسْفِرُوا بِالْفَجْرِ