وَمِنَ اللَّيْلِ فَتَهَجَّدْ بِهِ نَافِلَةً لَّكَ عَسَى أَن يَبْعَثَكَ رَبُّكَ مَقَامًا مَّحْمُودًا
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سورة الإسراء
(17/79) And of the night--keep the vigil therein, as an act of supererogation for thee; belike thy Lord will raise thee up in a station praised.
Surah Al-Isra