Qur'an 41:52
قُلْ أَرَءَيْتُمْ إِن كَانَ مِنْ عِندِ ٱللَّهِ ثُمَّ كَفَرْتُم بِهِۦ مَنْ أَضَلُّ مِمَّنْ هُوَ فِى شِقَاقٍۭ بَعِيدٍ
“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?"”
Fussilat 41:52 · Saheeh International