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) Whoever disbelieves in Allah after his belief (after having attained Hidayet) except for one who is forced while his heart is satisfied with Faith; but those who open their breasts to disbelief (doubts the person of Irshad and goes back to Misguidance, due to their willing of Misguidance Allah opens their breasts to disbelief), upon them is wrath from Allah, and for them is a great punishment.
Surah An-Nahl