﴿ 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.”

Remember when He caused drowsiness to overcome you, as a reassurance from Him�He [Sahl] said:Drowsiness (nuʿās) descends from the brain while yet the heart remains awake [lit. alive]. Sleep (nawm) [only descends] on the heart outwardly. That is the rule (ḥukm) [for] sleep. However, the same rule [that applied to the heart] regarding drowsiness [applies to] the spirit (rūḥ). His words: