17:78
أَقِمِ ٱل صَّلَوٰةَ لِ دُلُوكِ ٱل شَّمْسِ إِلَىٰ غَسَقِ ٱلَّ يْلِ وَ قُرْءَانَ ٱلْ فَجْرِ إِنَّ قُرْءَانَ ٱلْ فَجْرِ كَانَ مَشْهُودًا
Establish prayer at the decline of the sun [from its meridian] until the darkness of the night and [also] the Qur'an of dawn. Indeed, the recitation of dawn is ever witnessed.