أَفَمَن شَرَحَ اللَّهُ صَدرَهُ لِلإِسلامِ فَهُوَ عَلىٰ نورٍ مِن رَبِّهِ ۚ فَوَيلٌ لِلقاسِيَةِ قُلوبُهُم مِن ذِكرِ اللَّهِ ۚ أُولـٰئِكَ في ضَلالٍ مُبينٍ

So is one whose breast Allah has expanded to [accept] Islam and he is upon a light from his Lord [like one whose heart rejects it]? Then woe to those whose hearts are hardened against the remembrance of Allah. Those are in manifest error.