فَإِنۡ خِفۡتُمۡ فَرِجَالًا أَوۡ رُكۡبَانٗاۖ فَإِذَآ أَمِنتُمۡ فَٱذۡكُرُواْ ٱللَّهَ كَمَا عَلَّمَكُم مَّا لَمۡ تَكُونُواْ تَعۡلَمُونَ ٢٣٩
Fa in khiftum farijālan aw rukbānā, fa idhā amintum fadhkurullāha kamā ʿallamakum mā lam takūnū taʿlamūn.
And if you fear [an enemy, then pray] on foot or riding. But when you are secure, then remember Allāh [in prayer], as He has taught you that which you did not [previously] know.
Translation: Sahih International