Quran 3:89 — The Amramites (Ali-'Imran)

Exempted are those who repent thereafter, and reform. GOD is Forgiver, Most Merciful.

[3:88] Eternally they abide therein; the retribution is never commuted for them, nor will they be reprieved.

[3:90] Those who disbelieve after believing, then plunge deeper into disbelief, their repentance will not be accepted from them; they are the real strayers.