فَإِذا قَضَيتُمُ الصَّلاةَ فَاذكُرُوا اللَّهَ قِيامًا وَقُعودًا وَعَلىٰ جُنوبِكُم ۚ فَإِذَا اطمَأنَنتُم فَأَقيمُوا الصَّلاةَ ۚ إِنَّ الصَّلاةَ كانَت عَلَى المُؤمِنينَ كِتابًا مَوقوتًا

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.