فَإِذَا قَضَيْتُمُ الصَّلاَةَ فَاذْكُرُواْ اللّهَ قِيَامًا وَقُعُودًا وَعَلَى جُنُوبِكُمْ فَإِذَا اطْمَأْنَنتُمْ فَأَقِيمُواْ الصَّلاَةَ إِنَّ الصَّلاَةَ كَانَتْ عَلَى الْمُؤْمِنِينَ كِتَابًا مَّوْقُوتًا
[4:103]
Then when you have finished the prayer, remember Allah standing and sitting and reclining; but when you are secure (from danger) keep up prayer; surely prayer is a timed ordinance for the believers.
When ye pass (Congregational) prayers, celebrate Allah's praises, standing, sitting down, or lying down on your sides; but when ye are free from danger, set up Regular Prayers: For such prayers are enjoined on believers at stated times.
When ye have performed the act of worship, remember Allah, standing, sitting and reclining. And when ye are in safety, observe proper worship. Worship at fixed times hath been enjoined on the believers.