Sura al-Isrāʾ 17:78

أَقِمِ ٱلصَّلَوٰةَ لِدُلُوكِ ٱلشَّمْسِ إِلَىٰ غَسَقِ ٱلَّيْلِ وَقُرْءَانَ ٱلْفَجْرِ إِنَّ قُرْءَانَ ٱلْفَجْرِ كَانَ مَشْهُودًا

aqimi l-ṣalāta li-dulūki l-shamsi ilā ghasaqi l-layli wa-qurāna l-fajri inna qurāna l-fajri kāna mashhūdan

Establish regular prayers - at the sun's decline till the darkness of the night, and the morning prayer and reading: for the prayer and reading in the morning carry their testimony.