Surah Al-Hijr, Verse 96

ٱلَّذِينَ يَجۡعَلُونَ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَۚ فَسَوۡفَ يَعۡلَمُونَ٩٦

alladhīna yajʿalūna maʿa l-lahi ilāhan ākhara fasawfa yaʿlamūna

Who make [equal] with Allāh another deity. But they are going to know.