مَن كَفَرَ بِاللّهِ مِن بَعْدِ إيمَانِهِ إِلاَّ مَنْ أُكْرِهَ وَقَلْبُهُ مُطْمَئِنٌّ بِالإِيمَانِ وَلَكِن مَّن شَرَحَ بِالْكُفْرِ صَدْرًا فَعَلَيْهِمْ غَضَبٌ مِّنَ اللّهِ وَلَهُمْ عَذَابٌ عَظِيمٌ
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سورة النحل
(16/106) Whosoever disbelieveth in Allah after his belief--save him who is constrained and his heart is at rest with the belief -but whosoever expandeth his breast to infidelity, upon them shall be wrath from Allah, and unto them shall be a torment mighty.
Surah An-Nahl