Surah Al-Mu'minun — Ayah 117 (23:117)
وَمَن يَدۡعُ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ لَا بُرۡهَٰنَ لَهُۥ بِهِۦ فَإِنَّمَا حِسَابُهُۥ عِندَ رَبِّهِۦٓۚ إِنَّهُۥ لَا يُفۡلِحُ ٱلۡكَٰفِرُونَ ١١٧
English translation (Saheeh International)
And whoever invokes besides Allāh another deity for which he has no proof - then his account is only with his Lord. Indeed, the disbelievers will not succeed.
Brief commentary
Whoever calls upon another god besides Allah for which he has no proof (and this is the case with every god besides Allah), the reward of his bad action is with his Lord, as He is the One Who will reward him for it by punishing him. The disbelievers will not be successful in attaining what they desire and being saved from their fears.