"And what will make you know what Saqar is?" meaning: you did not know what Saqar was until I informed you.
﴿وَمَا أَدْرَاك مَا سقر﴾ أَيْ: أَنَّكَ لَمْ تَكُنْ تَدْرِي مَا سقر؛ حَتَّى أعلمتك
