Dr. Mustafa Khattab, the Clear Quran - Surah Al-Munafiqun, ayah 3

Translation of Surah Al-Munafiqun, ayah 3 (63:3)

ذَٰلِكَ بِأَنَّهُمۡ ءَامَنُواْ ثُمَّ كَفَرُواْ فَطُبِعَ عَلَىٰ قُلُوبِهِمۡ فَهُمۡ لَا يَفۡقَهُونَ ٣
This is because they believed and then abandoned faith. Therefore, their hearts have been sealed, so they do not comprehend.