أَقِمِ الصَّلاَةَ لِدُلُوكِ الشَّمْسِ إِلَى غَسَقِ اللَّيْلِ وَقُرْآنَ الْفَجْرِ إِنَّ قُرْآنَ الْفَجْرِ كَانَ مَشْهُودًا
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سورة الإسراء
(17/78) Establish thou the prayer from the declination of the sun to the darkening of the night, and the Recitation at the dawn; verily the Recitation at the dawn is ever borne witness to.
Surah Al-Isra