“And this is a blessed reminder,” meaning: the Qur’an. “Are you then deniers of it?” This refers to the polytheists, in the form of a question; meaning: you have denied it.
Surah al-Anbiya' from (verse 51 to verse 57).
﴿وَهَذَا ذكر مبارك﴾ يَعْنِي: الْقُرْآنَ. ﴿أَفَأَنْتُمْ لَهُ مُنْكِرُونَ﴾ يَعْنِي: الْمُشْرِكِينَ عَلَى الِاسْتِفْهَامِ؛ يَعْنِي: قد أنكرتموه.
سُورَة الْأَنْبِيَاء من (آيَة ٥١ آيَة ٥٧).