﴿ إِذْ يُغَشِّيكُمُ ٱلنُّعَاسَ أَمَنَةًۭ مِّنْهُ وَيُنَزِّلُ عَلَيْكُم مِّنَ ٱلسَّمَآءِ مَآءًۭ لِّيُطَهِّرَكُم بِهِۦ وَيُذْهِبَ عَنكُمْ رِجْزَ ٱلشَّيْطَٰنِ وَلِيَرْبِطَ عَلَىٰ قُلُوبِكُمْ وَيُثَبِّتَ بِهِ ٱلْأَقْدَامَ ﴾

“[Remember how it was] when He caused inner calm to enfold you, as an assurance from Him, and sent down upon you water from the skies, so that He might purify you thereby and free you from Satan's unclean whisperings and strengthen your hearts and thus make firm your steps.”

(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.