Surah Al-Ma'idah — Ayah 65 (5:65)
وَلَوۡ أَنَّ أَهۡلَ ٱلۡكِتَٰبِ ءَامَنُواْ وَٱتَّقَوۡاْ لَكَفَّرۡنَا عَنۡهُمۡ سَيِّـَٔاتِهِمۡ وَلَأَدۡخَلۡنَٰهُمۡ جَنَّٰتِ ٱلنَّعِيمِ ٦٥
English translation (Saheeh International)
And if only the People of the Scripture had believed and feared Allāh, We would have removed from them their misdeeds and admitted them to Gardens of Pleasure.
Brief commentary
If the Jews and the Christians accepted what was brought by Muhammad (peace be upon him) and were mindful of Allah by leaving sins, I would have forgiven the sins they committed, even if they were many, and I would have entered them on the Day of Judgement into gardens of delight, in which they would enjoy delights that will never end.