The Holy Quran 83:14 — Surah Al-Mutaffifin

Arabic text

كَلَّا ۖ بَلْ ۜ رَانَ عَلَىٰ قُلُوبِهِم مَّا كَانُوا۟ يَكْسِبُونَ

Translation

Never! (These are not fables, but the absolute truth!) In fact, (they refuse to believe because) the rust(stain) of their sins has covered (sealed) their hearts (so that no truth can penetrate it).

Tafsir (excerpt) — Tafsir Usmani

The rust on the hearts of the disbelievers: that is, there is no room for any doubt or suspicion in Our verses. The fact is that through the abundance of sins and constant indulgence in them, rust has settled on their hearts, and therefore true realities are not reflected in them.

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