وَٱلَّذِينَ يَدْعُونَ مِن دُونِ ٱللَّهِ لَا يَخْلُقُونَ شَيْـًٔا وَهُمْ يُخْلَقُونَ Qur’an An-Nahl (16:20)Waallatheena yadAAoona min dooni Allahi la yakhluqoona shayan wahum yukhlaqoona
Lit., "those whom they invoke": this refers - as is obvious from verse {21} below - to dead saints invested by their followers with divine or semi-divine qualities.
Allah is the only Creator and the Ultimate Reality. Everything else is created by Him, and reflects His glory. How foolish then to worship any other than Allah!