The Quran

Preface

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

Yusuf Ali

Thus have We sent by inspiration to thee an Arabic Qur-ān:¹ that thou mayest warn the Mother of Cities² and all around her,- and warn (them) of the Day of Assembly, of which there is no doubt: (when) some will be³ in the Garden, and some in the Blazing Fire.

The point of the Qur-ān being in Arabic is that it is plain and intelligible to the people through whom and among whom it was promulgated; see next clause.
The City of Mecca. See n. 913 to 6:92. This is undoubtedly a Meccan verse. Even apart from the Qiblah, Mecca is the centre of Islam, and “all around her” is the whole world.
The contrast is again emphasised, as explained in the Summary.