وَإِذَا ضَرَبْتُمْ فِى ٱلْأَرْضِ فَلَيْسَ عَلَيْكُمْ جُنَاحٌ أَن تَقْصُرُوا مِنَ ٱلصَّلَوٰةِ إِنْ خِفْتُمْ أَن يَفْتِنَكُمُ ٱلَّذِينَ كَفَرُوٓا ۚ إِنَّ ٱلْكَـٰفِرِينَ كَانُوا لَكُمْ عَدُوًّا مُّبِينًا

Wa-itha darabtum fee al-ardifalaysa AAalaykum junahun an taqsuroo mina assalatiin khiftum an yaftinakumu allatheena kafaroo inna alkafireenakanoo lakum AAaduwwan mubeena

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.