"No — rather, the stain has covered their hearts from what they used to earn."
Sūrah al-Muṭaffifīn 83:14
In When Sin Stops Feeling Like Sin
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Rān. A covering; a film. The lexicons reach for rust — the thin dark bloom that settles upon metal and eats it while it goes on shining. The whole of this book rests on that image.
Rust is not a blow. Nothing struck the metal, and nothing announced itself. It arrived one imperceptible layer at a time, out of the ordinary air, and by the time there is anything to see, the thing has been changing for years.
Qur'anic Arabic is reproduced in the Uthmani script. Hadith Arabic is reproduced from the published collections named above. The English is a rendering informed by widely used translations, offered as an aid to meaning and not a substitute for the Arabic. Verify what is cited, and consult people of knowledge on anything affecting practice.