Al-Isra · 17:78

78. Establish the prayer by performing it in the most complete manner in its times, which are the declining of the sun from the middle of the sky - and this includes the zuhr and ‘asr prayers - until the darkness of night - and this includes the maghrib and ‘isha prayers. And establish the fajr prayer and lengthen the recitation therein, as the fajr prayer is attended by the angels of night and the angels of day.