Sura Āl-ʿImrān 3:154

ثُمَّ أَنزَلَ عَلَيْكُم مِّنۢ بَعْدِ ٱلْغَمِّ أَمَنَةً نُّعَاسًا يَغْشَىٰ طَآئِفَةً مِّنكُمْ وَطَآئِفَةٌ قَدْ أَهَمَّتْهُمْ أَنفُسُهُمْ يَظُنُّونَ بِٱللَّـهِ غَيْرَ ٱلْحَقِّ ظَنَّ ٱلْجَٰهِلِيَّةِ يَقُولُونَ هَل لَّنَا مِنَ ٱلْأَمْرِ مِن شَىْءٍ قُلْ إِنَّ ٱلْأَمْرَ كُلَّهُۥ لِلَّـهِ يُخْفُونَ فِىٓ أَنفُسِهِم مَّا لَا يُبْدُونَ لَكَ يَقُولُونَ لَوْ كَانَ لَنَا مِنَ ٱلْأَمْرِ شَىْءٌ مَّا قُتِلْنَا هَٰهُنَا قُل لَّوْ كُنتُمْ فِى بُيُوتِكُمْ لَبَرَزَ ٱلَّذِينَ كُتِبَ عَلَيْهِمُ ٱلْقَتْلُ إِلَىٰ مَضَاجِعِهِمْ وَلِيَبْتَلِىَ ٱللَّـهُ مَا فِى صُدُورِكُمْ وَلِيُمَحِّصَ مَا فِى قُلُوبِكُمْ وَٱللَّـهُ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ

thumma anzala ʿalaykum min baʿdi l-ghammi amanatan nnuʿāsan yaghshā ṭāʾifatan minkum wa-ṭāʾifatun qad ahammathum anfusuhum yaẓunnūna billāhi ghayra l-ḥaqqi ẓanna l-jāhiliyyati yaqūlūna hal lanā mina l-amri min shayʾin qul inna l-amra kullahu lillāhi yukhfūna fī anfusihim mā lā yubdūna la-ka yaqūlūna law kāna la-nā mina l-amri shayʾun mā qutilnā hāhunā qul law kuntum fī buyūtikum labaraza lladhīna kutiba ʿalayhimu l-qatlu ilā maḍājiʿihim wa-li-yabtaliya allāhu mā fī ṣudūrikum wa-li-yumaḥḥiṣa mā fī qulūbikum wallāhu ʿalīmun bi-dhāti l-ṣudūri

After (the excitement) of the distress, He sent down calm on a band of you overcome with slumber, while another band was stirred to anxiety by their own feelings, Moved by wrong suspicions of Allah-suspicions due to ignorance. They said: "What affair is this of ours?" Say thou: "Indeed, this affair is wholly Allah's." They hide in their minds what they dare not reveal to thee. They say (to themselves): "If we had had anything to do with this affair, We should not have been in the slaughter here." Say: "Even if you had remained in your homes, those for whom death was decreed would certainly have gone forth to the place of their death"; but (all this was) that Allah might test what is in your breasts and purge what is in your hearts. For Allah knoweth well the secrets of your hearts.

Sura al-Anfāl 8:11

إِذْ يُغَشِّيكُمُ ٱلنُّعَاسَ أَمَنَةً مِّنْهُ وَيُنَزِّلُ عَلَيْكُم مِّنَ ٱلسَّمَآءِ مَآءً لِّيُطَهِّرَكُم بِهِۦ وَيُذْهِبَ عَنكُمْ رِجْزَ ٱلشَّيْطَٰنِ وَلِيَرْبِطَ عَلَىٰ قُلُوبِكُمْ وَيُثَبِّتَ بِهِ ٱلْأَقْدَامَ

idh yughashshīkumu l-nuʿāsa amanatan minhu wa-yunazzilu ʿalaykum mina l-samāʾi māʾan li-yuṭahhirakum bihi wa-yudhhiba ʿankum rijza l-shayṭāni wa-li-yarbiṭa ʿalā qulūbikum wa-yuthabbita bihi l-aqdāma

Remember He covered you with a sort of drowsiness, to give you calm as from Himself, and he caused rain to descend on you from heaven, to clean you therewith, to remove from you the stain of Satan, to strengthen your hearts, and to plant your feet firmly therewith.