The Holy Quran 30:59 — Surah Ar-Rum
Arabic text
كَذَٰلِكَ يَطْبَعُ ٱللَّهُ عَلَىٰ قُلُوبِ ٱلَّذِينَ لَا يَعْلَمُونَ
Translation
Thus has Allaah set a seal upon the hearts of those who have no knowledge (understanding of Towheed).
Tafsir (excerpt) — Tafsir Usmani
A seal is set upon the hearts: that is, the person who does not understand, nor tries to understand, and keeps denying everything out of obstinacy and hostility, gradually has a seal set upon his heart, and in the end, through obstinacy and hostility, the heart becomes so hard that he loses even the capacity to accept the truth. (We seek refuge with Allah!)
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