﴿ وَإِنَّهُۥ لَذِكْرٌۭ لَّكَ وَلِقَوْمِكَ ۖ وَسَوْفَ تُسْـَٔلُونَ ﴾

“and, verily, this [revelation] shall indeed become [a source of] eminence for thee and thy people: but in time you all will be called to account [for what you have done with it].”

(And lo!) i.e. the Qur'an (is in truth a Reminder for thee) an honour for you (and for thy folk) the Quraysh because it is revealed in their own language; (and ye will be questioned) about the gratitude which is owed to such an honour.