Al-Baqarah · Ayah 239
فَإِنْ خِفْتُمْ فَرِجَالًا أَوْ رُكْبَانًا فَإِذَآ أَمِنتُمْ فَٱذْكُرُوا۟ ٱللَّهَ كَمَا عَلَّمَكُم مَّا لَمْ تَكُونُوا۟ تَعْلَمُونَ
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.
Quran 2:239 (Al-Baqarah) · Saheeh International, Noor International Center (QuranEnc v1.1.2)