Jami` at-Tirmidhi, Volume 5, Book 44, Hadith 3135 (DarusSalam) ⓘ
Narrated Abu Hurairah: regarding Allah, Most High, saying: "And recite the Qur'an in the early dawn. Verily the recitation of the Qur'an in the early dawn is ever witnessed (17:78)." The Prophet said: "It is witnessed by the angels of the night and the angels of the day."
حَدَّثَنَا عُبَيْدُ بْنُ أَسْبَاطِ بْنِ مُحَمَّدٍ، - قُرَشِيٌّ كُوفِيٌّ حَدَّثَنَا أَبِي، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم فِي قَوْلِهِ : ( وَقُرْآنَ الْفَجْرِ إِنَّ قُرْآنَ الْفَجْرِ كَانَ مَشْهُودًا ) قَالَ " تَشْهَدُهُ مَلاَئِكَةُ اللَّيْلِ وَمَلاَئِكَةُ النَّهَارِ " . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 3135 (Reference) & Book 47, Hadith 3427 (In-Book)