The Holy Quran 4:18 — Surah An-Nisa
Arabic text
وَلَيْسَتِ ٱلتَّوْبَةُ لِلَّذِينَ يَعْمَلُونَ ٱلسَّيِّـَٔاتِ حَتَّىٰٓ إِذَا حَضَرَ أَحَدَهُمُ ٱلْمَوْتُ قَالَ إِنِّى تُبْتُ ٱلْـَٔـٰنَ وَلَا ٱلَّذِينَ يَمُوتُونَ وَهُمْ كُفَّارٌ ۚ أُو۟لَـٰٓئِكَ أَعْتَدْنَا لَهُمْ عَذَابًا أَلِيمًا
Translation
Forgiveness is not for those who (continue to) commit evil acts (without repenting) and then, when death presents itself before any of them (and they can see the angels of death before them), he says, 'Now I repent!'. Nor is it (forgiveness) for those who die as Kuffaar (and who repent in the Aakhirah. Such people will never be forgiven). We have prepared for such people a painful punishment.
Tafsir (excerpt) — Tafsir Usmani
That is, nor is the repentance accepted of such people as go on sinning continuously and do not desist, until, when death itself appears before his eyes, he starts saying at that moment: “Now I repent.” Nor will the repentance be accepted of those who died in disbelief and then, after seeing the punishment of the Hereafter, repent.
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