Surah Fussilat, Verse 42
Translation — Sahih International
Falsehood cannot approach it from before it or from behind it; [it is] a revelation from a [Lord who is] Wise and Praiseworthy.
Source
Kur'an-ı Kerim, Fussilet Suresi 41:42
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/41-suresi-42-ayet