An-Nahl - 16:51

وَقَالَ اللّهُ لاَ تَتَّخِذُواْ إِلـهَيْنِ اثْنَيْنِ إِنَّمَا هُوَ إِلهٌ وَاحِدٌ فَإيَّايَ فَارْهَبُونِ
[16:51]
And Allah has said: Take not two gods, He is only one Allah; so of Me alone should you be afraid.
Allah has said: "Take not (for worship) two gods: for He is just One Allah: then fear Me (and Me alone)."
Allah hath said: Choose not two gods. There is only One Allah. So of Me, Me only, be in awe.