4:103
فَ إِذَا قَضَيْ تُمُ ٱل صَّلَوٰةَ فَ ٱذْكُرُ وا۟ ٱللَّهَ قِيَٰمًا وَ قُعُودًا وَ عَلَىٰ جُنُوبِ كُمْ فَ إِذَا ٱطْمَأْنَن تُمْ فَ أَقِيمُ وا۟ ٱل صَّلَوٰةَ إِنَّ ٱل صَّلَوٰةَ كَانَتْ عَلَى ٱلْ مُؤْمِنِينَ كِتَٰبًا مَّوْقُوتًا
And when you have completed the prayer, remember Allah standing, sitting, or [lying] on your sides. But when you become secure, re-establish [regular] prayer. Indeed, prayer has been decreed upon the believers a decree of specified times.