But repentance is not [accepted] of those who [continue to] do evil deeds up until, when death comes to one of them, he says, "Indeed, I have repented now," or of those who die while they are disbelievers. For them We have prepared a painful punishment.
English Transliteration
Walaysati alttawbatu lillatheena yaAAmaloona alssayyiati hatta ithahadara ahadahumu almawtu qala innee tubtu alana wala allatheena yamootoona wahum kuffarun olaika aAAtadna lahum AAathaban aleeman
Tafsir of Verse 18
But God shall not turn towards those who do evil deeds until, when one of them is visited by death, he says, 'Indeed now I repent,' neither to those who die disbelieving; for them We have prepared a painful chastisement.
Of no effect is the repentance of those who continue to do evil, until death faces one of them, and he says, "Now have I repented indeed;" nor of those who die rejecting Faith: for them have We prepared a punishment most grievous.