And when you have completed the prayer, remember Allah standing, sitting, or (4:103)

﴿فَإِذَا قَضَيْتُمُ الصَّلَاةَ فَاذْكُرُوا اللَّهَ قِيَامًا وَقُعُودًا وَعَلَىٰ جُنُوبِكُمْ ۚ فَإِذَا اطْمَأْنَنتُمْ فَأَقِيمُوا الصَّلَاةَ ۚ إِنَّ الصَّلَاةَ كَانَتْ عَلَى الْمُؤْمِنِينَ كِتَابًا مَّوْقُوتًا﴾
[ النساء: 103]

4:103 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.

When you, O believers, have finished the prayer, then remember Allah by glorifying Him by saying ‘Subḥān Allāh’, praising Him by saying ‘Alḥamdulillāh’ and declaring His Oneness by saying ‘Lā ilāha illallāh’.
This is to be done however possible, whether you are standing, sitting or lying on your sides.
When the fear is gone and you are safe, then establish the prayer by fulfilling all its articles, obligations and recommendations, as you have been instructed.
Prayer is an obligation on the believers that is linked to particular times and may not be delayed without a valid reason when one is a resident.
However, when you are travelling you are allowed to join and shorten prayers.

When you have finished As-Salat (the prayer - congregational), remember Allah standing, sitting down, and lying down on your sides, but when you are free from danger, perform As-Salat (Iqamat-as- Salat). Verily, the prayer is enjoined on the believers at fixed hours.

phonetic Transliteration

Faitha qadaytumu alssalata faothkuroo Allaha qiyaman waquAAoodan waAAala junoobikum faitha itmanantum faaqeemoo alssalata inna alssalata kanat AAala almumineena kitaban mawqootan

Abdullah Yusuf Ali - Translation

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.

Safi-ur-Rahman al-Mubarakpuri

When you have finished the Salah, remember Allah standing, sitting down, and on your sides, but when you are free from danger, perform the Salah. Verily, Salah is kitaban on the believers at fixed hours.

Page 95 English transliteration