Surah An-Nisa 4:101

وَإِذَا ضَرَبْتُمْ فِى ٱلْأَرْضِ فَلَيْسَ عَلَيْكُمْ جُنَاحٌ أَن تَقْصُرُوا۟ مِنَ ٱلصَّلَوٰةِ إِنْ خِفْتُمْ أَن يَفْتِنَكُمُ ٱلَّذِينَ كَفَرُوٓا۟ ۚ إِنَّ ٱلْكَـٰفِرِينَ كَانُوا۟ لَكُمْ عَدُوًّا مُّبِينًا

And when you travel throughout the land, there is no blame upon you for shortening the prayer, [especially] if you fear that those who disbelieve may disrupt [or attack] you. Indeed, the disbelievers are ever to you a clear enemy.

Translation: Saheeh International

Tafsir

And when you are going forth travelling in the land you would not be at fault if you shorten the prayer by making it two genuflexions instead of four if you fear that you may be afflicted by those who do not believe that is if you fear that you may be harmed by them this fear of affliction at the hands of the …

Excerpt from Tafsir al-Jalalayn, commentary on 4:101, via Quran.com. The reader has the full commentary and 9 more tafsirs.