Sunan ibn Mājah Ḥadīth [4248]
It is narrated on the authority of Abī Hurayrah (may Allāh be pleased with him) that the Prophet (peace and blessings of Allāh be upon him) said: “If your sins were to reach to the heavens and then you repented, Allāh would still accept your repentance.”
Commentary by Dārussalām added.