An Nisa, 18 Ayah
4:18
وَلَيۡسَتِ ٱلتَّوۡبَةُ لِلَّذِينَ يَعۡمَلُونَ ٱلسَّيِّـَٔاتِ حَتَّىٰٓ إِذَا حَضَرَ أَحَدَهُمُ ٱلۡمَوۡتُ قَالَ إِنِّي تُبۡتُ ٱلۡـَٰٔنَ وَلَا ٱلَّذِينَ يَمُوتُونَ وَهُمۡ كُفَّارٌۚ أُوْلَٰٓئِكَ أَعۡتَدۡنَا لَهُمۡ عَذَابًا أَلِيمٗا ١٨
Wa Laysati At-Tawbatu Lilladhīna Ya`malūna As-Sayyi'āti Ĥattá 'Idhā Ĥađara 'Aĥadahumu Al-Mawtu Qāla 'Innī Tubtu Al-'Āna Wa Lā Al-Ladhīna Yamūtūna Wa Hum Kuffārun ۚ 'Ūlā'ika 'A`tadnā Lahum `Adhābāan 'Alīmāan
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.