﴿ وَكَذَٰلِكَ أَوْحَيْنَآ إِلَيْكَ قُرْءَانًا عَرَبِيًّۭا لِّتُنذِرَ أُمَّ ٱلْقُرَىٰ وَمَنْ حَوْلَهَا وَتُنذِرَ يَوْمَ ٱلْجَمْعِ لَا رَيْبَ فِيهِ ۚ فَرِيقٌۭ فِى ٱلْجَنَّةِ وَفَرِيقٌۭ فِى ٱلسَّعِيرِ ﴾

“[Thou art but entrusted with Our message:] and so We have revealed unto thee a discourse in the Arabic tongue in order that thou mayest warn the foremost of all cities and all who dwell around it to wit, warn [them] of the Day of the Gathering, [the coming of] which is beyond all doubt: [the Day when] some shall find themselves in paradise, and some in the blazing flame.”

Please check ayah 42:8 for complete tafsir.