إِذْ يُغَشِّيكُمُ ٱلنُّعَاسَ أَمَنَةًۭ مِّنْهُ وَيُنَزِّلُ عَلَيْكُم مِّنَ ٱلسَّمَآءِ مَآءًۭ لِّيُطَهِّرَكُم بِهِۦ وَيُذْهِبَ عَنكُمْ رِجْزَ ٱلشَّيْطَٰنِ وَلِيَرْبِطَ عَلَىٰ قُلُوبِكُمْ وَيُثَبِّتَ بِهِ ٱلْأَقْدَامَ
[Remember] when He overwhelmed you with drowsiness [giving] security from Him and sent down upon you from the sky, rain by which to purify you and remove from you the evil [suggestions] of Satan and to make steadfast your hearts and plant firmly thereby your feet.
(When He made the slumber fall upon you) when He cast sleepiness upon you (as a reassurance) to you (from Him) from Allah against the enemy; and this is a favour from Allah towards you (and sent down water) rain (from the sky upon you, that thereby He might purify you) with rain from physical and minor and major ritual impurities, (and remove from you the fear of Satan) the whispering of Satan, (and make strong your hearts) and preserve your hearts with steadfastness (and firm) by means of the rain ((your) feet thereby) on the sand, i.e. He gathers the sand such that feet become firm on it.