The Holy Quran 17:82 — Surah Al-Isra

Arabic text

وَنُنَزِّلُ مِنَ ٱلْقُرْءَانِ مَا هُوَ شِفَآءٌ وَرَحْمَةٌ لِّلْمُؤْمِنِينَ ۙ وَلَا يَزِيدُ ٱلظَّـٰلِمِينَ إِلَّا خَسَارًا

Translation

We have revealed such a Qur'aan that is a cure (from physical and spiritual diseases) and mercy for the Mu'mineen. (However,) It only increases the loss of the oppressors (the Kuffaar are plunged further into kufr each time they hear the Qur'aan because they reject everything they hear).

Tafsir (excerpt) — Tafsir Usmani

The Noble Quran is healing and mercy: that is, just as falsehood flees when the truth arrives, so the verses of the Quran, which keep being revealed gradually, remove spiritual diseases: the ailments of false beliefs, blameworthy morals, doubts and suspicions are wiped away from hearts, and inner health is attained.

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