The Quran

وَكَذٰلِكَ أَوحَينا إِلَيكَ قُرآنًا عَرَبِيًّا لِتُنذِرَ أُمَّ القُرىٰ وَمَن حَولَها وَتُنذِرَ يَومَ الجَمعِ لا رَيبَ فيهِ ۚ فَريقٌ فِي الجَنَّةِ وَفَريقٌ فِي السَّعيرِ

Ali Unal

And just so (as We revealed these truths to the Messengers before you), We reveal to you a Qur’ān (a Recitation) in Arabic so that you may warn the mother-city and all those around it,¹ and warn of the Day of Assembly, about (the coming of) which there is no doubt. One party will be in Paradise, and one party in the Blaze.²

God’s Messenger, upon him be peace and blessings, was ordered to begin his mission with his nearest relatives (26: 214), and then to warn all the Makkan people (in this verse) and all the Arab people (in this verse and 41: 3,) and then all conscious beings (all humankind and jinn) (38: 87; 21: 107).
The second part of the verse is of the same import as verses 103 and 105 in Sūrah Hūd: That is a day when all humankind will be gathered together Among those (gathered together), some are wretched and some happy.