Quran 15:96 from Surah Al-Hijr on Divine Marvels.
ٱلَّذِينَ يَجۡعَلُونَ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَۚ فَسَوۡفَ يَعۡلَمُونَ
English translation: Those who set up with Allah god another But soon they will come to know
Transliteration: alladhina yaj'aluna ma'a al-lahi ilahan akhara fasawfa ya'lamuna