أَفَمَن شَرَحَ اللَّهُ صَدْرَهُ لِلْإِسْلَامِ فَهُوَ عَلَى نُورٍ مِّن رَّبِّهِ فَوَيْلٌ لِّلْقَاسِيَةِ قُلُوبُهُم مِّن ذِكْرِ اللَّهِ أُوْلَئِكَ فِي ضَلَالٍ مُبِينٍ
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سورة الزمر
(39/22) Whose heart Allah slit for Islam (to submit to Allah) so that he is upon a glorious light from his Lord, is not he? Woe to those whose hearts are darkened (and hardened) from the Remembrance (Dhikr) of Allah! Those are in a manifest Misguidance.
Surah Az-Zumar