وَإِذَا ضَرَبْتُمْ فِي الأَرْضِ فَلَيْسَ عَلَيْكُمْ جُنَاحٌ أَن تَقْصُرُواْ مِنَ الصَّلاَةِ إِنْ خِفْتُمْ أَن يَفْتِنَكُمُ الَّذِينَ كَفَرُواْ إِنَّ الْكَافِرِينَ كَانُواْ لَكُمْ عَدُوًّا مُّبِينًا
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سورة النساء
(4/101) And when you journey in the earth there is no sin on you if you shorten the prayer, if you fear that those who disbelieve will cause you harm; surely the disbelievers are an open enemy to you.
Surah An-Nisa