Qur'an 42:21

أَمْ لَهُمْ شُرَكَـٰٓؤُا۟ شَرَعُوا۟ لَهُم مِّنَ ٱلدِّينِ مَا لَمْ يَأْذَنۢ بِهِ ٱللَّهُ ۚ وَلَوْلَا كَلِمَةُ ٱلْفَصْلِ لَقُضِىَ بَيْنَهُمْ ۗ وَإِنَّ ٱلظَّـٰلِمِينَ لَهُمْ عَذَابٌ أَلِيمٌ

Or have they partners (of Allah) who have made lawful for them in religion that which Allah allowed not? And but for a decisive word (gone forth already), it would have been judged between them. Lo! for wrong-doers is a painful doom.