Al-Munāfiqūn - 3

﴿ذَٰلِكَ بِأَنَّهُمْ آمَنُوا ثُمَّ كَفَرُوا فَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ﴾

---

(3) That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.