قُلْ إِنَّمَا يُوحَىٰٓ إِلَىَّ أَنَّمَآ إِلَٰهُكُمْ إِلَٰهٌ وَٰحِدٌ ۖ فَهَلْ أَنتُم مُّسْلِمُونَ
18:111; 41:7.
Commentary:
As against the religion which Gog and Magog profess and preach and which teaches belief in three gods, to declare and proclaim and preach that our God is one God and the belief in the Trinity is false is indeed a difficult task.
18:111; 41:7.