Qur'ān 26:213 · Ash-Shu'ara (الشعراء)

فَلَا تَدْعُ مَعَ ٱللَّهِ إِلَـٰهًا ءَاخَرَ فَتَكُونَ مِنَ ٱلْمُعَذَّبِينَ

So do not invoke with Allah another deity and [thus] be among the punished.