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Surah 3. Aal-Imran
Ayah 154
154ثُمَّ أَنزَلَ عَلَيْكُم مِّنۢ بَعْدِ ٱلْغَمِّ أَمَنَةً نُّعَاسًا يَغْشَىٰ طَآئِفَةً مِّنكُمْ ۖ وَطَآئِفَةٌ قَدْ أَهَمَّتْهُمْ أَنفُسُهُمْ يَظُنُّونَ بِٱللَّهِ غَيْرَ ٱلْحَقِّ ظَنَّ ٱلْجَـٰهِلِيَّةِ ۖ يَقُولُونَ هَل لَّنَا مِنَ ٱلْأَمْرِ مِن شَىْءٍ ۗ قُلْ إِنَّ ٱلْأَمْرَ كُلَّهُۥ لِلَّهِ ۗ يُخْفُونَ فِىٓ أَنفُسِهِم مَّا لَا يُبْدُونَ لَكَ ۖ يَقُولُونَ لَوْ كَانَ لَنَا مِنَ ٱلْأَمْرِ شَىْءٌ مَّا قُتِلْنَا هَـٰهُنَا ۗ قُل لَّوْ كُنتُمْ فِى بُيُوتِكُمْ لَبَرَزَ ٱلَّذِينَ كُتِبَ عَلَيْهِمُ ٱلْقَتْلُ إِلَىٰ مَضَاجِعِهِمْ ۖ وَلِيَبْتَلِىَ ٱللَّهُ مَا فِى صُدُورِكُمْ وَلِيُمَحِّصَ مَا فِى قُلُوبِكُمْ ۗ وَٱللَّهُ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
[154] Then after this grief, Allah sent down upon some of you such a sense of peace and security that they began to drowse,112 but the others, who attached importance only to their own worldly interests, began to cherish about Allah thoughts of ignorance which were void of truth. Now they ask, "Have we also a say in .the conduct of affairs?" Say, ("No one has share in this.) The authority over the affairs rests wholly with Allah." In fact they are not disclosing to you what they are concealing in their hearts: what they really mean is this: "If we had a say (in the conduct of) the affairs, none of us would have been slain here." Tell them, "Even though you had remained in your houses, those, who were destined to be slain, would have gone forth of their own accord to the places where they were destined to be slain." And all this happened so that Allah may test that which was hidden in your hearts, and sort out the base thing from your hearts. Allah is fully aware of what is in the hearts.
112This was a favour shown to those Muslims who had remained firm in the battle. They experienced such a strange sense of security that in spite of their sorrow, they began to feel drowsy. Hadrat Abu Talhah, who had taken part in the battle, says that they were so overpowered by drowsiness that even their swords began to fall from their hands.