المنافقون · Verse 3 / 11 · Page 554
ذَلِكَ بِأَنَّهُمْ آمَنُوا ثُمَّ كَفَرُوا فَطُبِعَ عَلَى قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
Zaalika bi annahum aamanoo summa kafaroo fatubi'a 'alaa quloobihim fahum laa yafqahoon
That is because they believed, and then they disbelieved; so their hearts were sealed over, and they do not understand.
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.
Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.
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