ثُمَّ Then أَنزَلَ He sent down عَلَيْكُم upon you مِّنۢ from بَعْدِ after ٱلْغَمِّ the distress أَمَنَةًۭ security نُّعَاسًۭا slumber يَغْشَىٰ overcoming طَآئِفَةًۭ a group مِّنكُمْ ۖ of you وَطَآئِفَةٌۭ while a group قَدْ certainly أَهَمَّتْهُمْ worried [them] أَنفُسُهُمْ (about) themselves يَظُنُّونَ thinking بِٱللَّهِ about Allah غَيْرَ other than ٱلْحَقِّ the truth ظَنَّ (the) thought ٱلْجَـٰهِلِيَّةِ ۖ (of) [the] ignorance يَقُولُونَ saying هَل Is (there) لَّنَا for us مِنَ from ٱلْأَمْرِ the matter مِن any شَىْءٍۢ ۗ thing قُلْ Say إِنَّ Indeed ٱلْأَمْرَ the matter كُلَّهُۥ all (of) it لِلَّهِ ۗ (is) for Allah يُخْفُونَ They hide فِىٓ in أَنفُسِهِم themselves مَّا what لَا not يُبْدُونَ they reveal لَكَ ۖ to you يَقُولُونَ They say لَوْ If كَانَ was لَنَا for us مِنَ from ٱلْأَمْرِ the matter شَىْءٌۭ anything مَّا not قُتِلْنَا we would have been killed هَـٰهُنَا ۗ here قُل Say لَّوْ If كُنتُمْ you were فِى in بُيُوتِكُمْ your houses لَبَرَزَ surely (would have) come out ٱلَّذِينَ those who كُتِبَ was decreed عَلَيْهِمُ upon them ٱلْقَتْلُ [the] death إِلَىٰ towards مَضَاجِعِهِمْ ۖ their places of death وَلِيَبْتَلِىَ And that might test ٱللَّهُ Allah مَا what فِى (is) in صُدُورِكُمْ your breasts وَلِيُمَحِّصَ and that He may purge مَا what فِى (is) in قُلُوبِكُمْ ۗ your hearts وَٱللَّهُ And Allah عَلِيمٌۢ (is) All-Aware بِذَاتِ of what ٱلصُّدُورِ (is in) the breasts ١٥٤
Then after distress, He sent down upon you security [in the form of] drowsiness, overcoming a faction of you, while another faction worried about themselves, thinking of Allāh other than the truth - the thought of ignorance, saying, "Is there anything for us [to have done] in this matter?" Say, "Indeed, the matter belongs completely to Allāh." They conceal within themselves what they will not reveal to you. They say, "If there was anything we could have done in the matter, we [i.e., some of us] would not have been killed right here." Say, "Even if you had been inside your houses, those decreed to be killed would have come out to their death beds." [It was] so that Allāh might test what is in your breasts and purify what is in your hearts. And Allāh is Knowing of that within the breasts.
— Come To Light