Surah Al-Munafiqun, Ayah 3
Quran 63:3 · The Hypocrites · Madani · Para 28 · Page 554
ذٰلِكَ بِاَنَّهُمْ اٰمَنُوْا ثُمَّ كَفَرُوْا فَطُبِعَ عَلٰی قُلُوْبِهِمْ فَهُمْ لَا یَفْقَهُوْنَ ۟
Transliteration
Thalika bi-annahum amanoothumma kafaroo fatubiAAa AAala quloobihim fahum layafqahoon
Saheeh International
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.
Al-Mukhtasar fi Tafsir
That is because they hypocritically professed faith, but faith did not reach their hearts, and then they secretly rejected Allah, so He put a seal on their hearts on account of their disbelief so that faith cannot enter it. Due to this seal they do not understand that in which lies their rectitude and righteousness.
Tafsir Ibn Kathir (abridged)
Explains 63:1–63:4 together — read it on 63:1