Surah Fussilat, Verse 52

قُلۡ أَرَءَيۡتُمۡ إِن كَانَ مِنۡ عِندِ ٱللَّهِ ثُمَّ كَفَرۡتُم بِهِۦ مَنۡ أَضَلُّ مِمَّنۡ هُوَ فِي شِقَاقِۭ بَعِيدٖ٥٢

qul ara-aytum in kāna min ʿindi l-lahi thumma kafartum bihi man aḍallu mimman huwa fī shiqāqin baʿīdin

Say, "Have you considered: if it [i.e., the Qur’ān] is from Allāh and you disbelieved in it, who would be more astray than one who is in extreme dissension?"