Surat Yūsuf - سورة يوسف

مَا تَعْبُدُونَ مِن دُونِهِ إِلَّا أَسْمَاءً سَمَّيْتُمُوهَا أَنتُمْ وَآبَاؤُكُم مَّا أَنزَلَ اللَّهُ بِهَا مِن سُلْطَانٍ ۚ إِنِ الْحُكْمُ إِلَّا لِلَّهِ ۚ أَمَرَ أَلَّا تَعْبُدُوا إِلَّا إِيَّاهُ ۚ ذَٰلِكَ الدِّينُ الْقَيِّمُ وَلَٰكِنَّ أَكْثَرَ النَّاسِ لَا يَعْلَمُونَ

Muhsin Khan: "You do not worship besides Him but only names which you have named (forged), you and your fathers, for which Allah has sent down no authority. The command (or the judgement) is for none but Allah. He has commanded that you worship none but Him (i.e. His Monotheism), that is the (true) straight religion, but most men know not.