Al Quran Ayath

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إِنَّ الصَّلاَةَ كَانَتْ عَلَى الْمُؤْمِنِينَ كِتَابًا مَّوْقُوتًا
Indeed, prayer has been decreed upon the believersa decree of specified times
(Surat An'Nisa 103)