Qur'ān 41:52 · Fussilat (فصلت)

قُلْ أَرَءَيْتُمْ إِن كَانَ مِنْ عِندِ ٱللَّهِ ثُمَّ كَفَرْتُم بِهِۦ مَنْ أَضَلُّ مِمَّنْ هُوَ فِى شِقَاقٍۭ بَعِيدٍۢ

Say, "Have you considered: if the Qur'an is from Allah and you disbelieved in it, who would be more astray than one who is in extreme dissension?"