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 ye are journeying in the earth there shall be no fault in you that ye shorten the prayer if ye fear that those who disbelieve shall molest you, verily the infidels are ever unto you an avowed enemy.
Surah An-Nisa