An-Nisa · Ayah 101
وَإِذَا ضَرَبْتُمْ فِى ٱلْأَرْضِ فَلَيْسَ عَلَيْكُمْ جُنَاحٌ أَن تَقْصُرُوا۟ مِنَ ٱلصَّلَوٰةِ إِنْ خِفْتُمْ أَن يَفْتِنَكُمُ ٱلَّذِينَ كَفَرُوٓا۟ إِنَّ ٱلْكَٰفِرِينَ كَانُوا۟ لَكُمْ عَدُوًّا مُّبِينًا
And when you travel throughout the land, there is no blame upon you for shortening the prayer,[215] [especially] if you fear that those who disbelieve may disrupt [or attack] you.[216] Indeed, the disbelievers are ever to you a clear enemy.
Translator's notes
[215] The four rakʿah prayers are shortened to two rakʿahs. [216] The example of the Prophet (ﷺ) and his companions illustrates that fear is not a condition for this allowance, merely travel.
Quran 4:101 (An-Nisa) · Saheeh International, Noor International Center (QuranEnc v1.1.2)