Surah Fussilat, Verse 52
Translation — Sahih International
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?"
Source
Kur'an-ı Kerim, Fussilet Suresi 41:52
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/41-suresi-52-ayet