دَرَسُ

أَمْ لَكُمْ كِتَـٰبٌۭ فِيهِ تَدْرُسُونَ

Or do you have a scripture in which you learn

وَكَذَٰلِكَ نُصَرِّفُ ٱلْـَٔايَـٰتِ وَلِيَقُولُوا۟ دَرَسْتَ وَلِنُبَيِّنَهُۥ لِقَوْمٍۢ يَعْلَمُونَ

And thus do We diversify the verses so they [i.e., the disbelievers] will say, "You have studied," and so We may make it [i.e., the Qur’ān] clear for a people who know.

وَمَآ ءَاتَيْنَـٰهُم مِّن كُتُبٍۢ يَدْرُسُونَهَا ۖ وَمَآ أَرْسَلْنَآ إِلَيْهِمْ قَبْلَكَ مِن نَّذِيرٍۢ

And We had not given them any scriptures which they could study, and We had not sent to them before you, [O Muḥammad], any warner.