إِنَّ الَّذِينَ اشْتَرَوُا الْكُفْرَ بِالْإِيمَانِ لَن يَضُرُّوا اللَّهَ شَيْئًا وَلَهُمْ عَذَابٌ أَلِيمٌ

Those who have bought unfaith for faith will not hurt Allah in the least, and there is a painful punishment for them.