The Holy Quran 6:28 — Surah Al-An'am

Arabic text

بَلْ بَدَا لَهُم مَّا كَانُوا۟ يُخْفُونَ مِن قَبْلُ ۖ وَلَوْ رُدُّوا۟ لَعَادُوا۟ لِمَا نُهُوا۟ عَنْهُ وَإِنَّهُمْ لَكَـٰذِبُونَ

Translation

In fact, that (knowledge of punishment for the Kuffaar) which they used to hide (from others) would become clear to them (on the Day of Qiyaamah). If they were to be sent back (to the world), they would (again) return to what they had been prohibited from (they would commit Shirk again) and they truly are liars (because they will not fulfil their promise to be Mu'mineen if they were ever returned to the world).

Tafsir (excerpt) — Tafsir Usmani

The regret and remorse of the idolaters in the Hereafter: that is, even now their wish to return to the world does not come from true resolve or from desire and longing for faith. Rather, when that scene of recompense and requital of deeds which, despite the clarity of the proofs, they used to hide behind the veil of denial came before them; when they saw…

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