فَإِن خِفتُم فَرِجالًا أَو رُكبانًا ۖ فَإِذا أَمِنتُم فَاذكُرُوا اللَّهَ كَما عَلَّمَكُم ما لَم تَكونوا تَعلَمونَ

If you’re in fear, then on foot or riding. But when you’re secure, remember God, as He taught you what you didn’t previously know.