Al-Isrâ’ 17:79
وَمِنَ اللَّيْلِ فَتَهَجَّدْ بِهِ نَافِلَةً لَّكَ عَسَىٰ أَن يَبْعَثَكَ رَبُّكَ مَقَامًا مَّحْمُودًا ٧٩
Wamina allayli fatahajjad bihi nafilatan laka AAasa an yabAAathaka rabbuka maqaman mahmoodan
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And as for the night, keep vigil a part of it, as a work of supererogation for thee; it may be that thy Lord will raise thee up to a laudable station. (17:79)