فَإنْ خِفْتُمْ فَرِجَالاً أَوْ رُكْبَانًا فَإِذَا أَمِنتُمْ فَاذْكُرُواْ اللّهَ كَمَا عَلَّمَكُم مَّا لَمْ تَكُونُواْ تَعْلَمُونَ
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سورة البقرة
(2/239) And if ye fear, then pray on foot or riding; then when ye are secure, remember Allah in the way He hath taught you which ye ever knew not.
Surah Al-Baqarah