Absence of Divine Authority for Idolatry

أَمْ أَنزَلْنَا عَلَيْهِمْ سُلْطَـٰنًا فَهُوَ يَتَكَلَّمُ بِمَا كَانُوا۟ بِهِۦ يُشْرِكُونَ

Or have We sent down to them an authority [i.e., a proof or scripture], and it speaks of what they have been associating with Him?