The Holy Quran 6:125 — Surah Al-An'am

Arabic text

فَمَن يُرِدِ ٱللَّهُ أَن يَهْدِيَهُۥ يَشْرَحْ صَدْرَهُۥ لِلْإِسْلَـٰمِ ۖ وَمَن يُرِدْ أَن يُضِلَّهُۥ يَجْعَلْ صَدْرَهُۥ ضَيِّقًا حَرَجًا كَأَنَّمَا يَصَّعَّدُ فِى ٱلسَّمَآءِ ۚ كَذَٰلِكَ يَجْعَلُ ٱللَّهُ ٱلرِّجْسَ عَلَى ٱلَّذِينَ لَا يُؤْمِنُونَ

Translation

Whoever Allaah wishes to guide, He expands (opens) his bosom for Islaam (by placing the light of Imaan into it). (On the other hand,) Whoever He desires (wills) to send astray, He narrows (by means of wayward ideas) and constricts his bosom (by means of wayward ideas so that it cannot accept Imaan) as if he is (a person who is) climbing into the sky (having great difficulty breathing because of the scarcity of oxygen). In this manner (as such a person experienced great difficulty) Allaah places impurity (punishment, His curse or Shayaateen) on those who do not have Imaan.

Tafsir (excerpt) — Tafsir Usmani

that is, he wants with all his strength to climb up into the sky but cannot, and so he feels severe constriction in his breast.

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