Surah Adh-Dhariyat, ayah 51

وَلَا تَجۡعَلُواْ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَۖ إِنِّي لَكُم مِّنۡهُ نَذِيرٞ مُّبِينٞ ٥١

Walā taj'alū ma'allāhi ilāhan ākhara innī lakum minhu nadhīrum mubīn

And do not make [as equal] with Allāh another deity. Indeed, I am to you from Him a clear warner.