An-Nisa 4:18

Walaysati attawbatu lillatheenayaAAmaloona assayyi-ati hatta ithahadara ahadahumu almawtu qala inneetubtu al-ana wala allatheena yamootoonawahum kuffarun ola-ika aAAtadna lahum AAathabanaleema

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.

The relenting is not for those who do the evil deeds, until when the time of death approaches one of them, he says, “Now I repent”, nor for those who die while they are still disbelievers. For them We have prepared a painful punishment