Quran 26:213 from Surah Ash-Shu'araa on Divine Marvels.
فَلَا تَدۡعُ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ فَتَكُونَ مِنَ ٱلۡمُعَذَّبِينَ
English translation: So (do) not invoke with Allah god another lest you be of those punished
Transliteration: fala tad'u ma'a al-lahi ilahan akhara fatakuna mina al-mu'adhabina