لَقَد كَفَرَ الَّذينَ قالوا إِنَّ اللَّهَ ثالِثُ ثَلاثَةٍ ۘ وَما مِن إِلـٰهٍ إِلّا إِلـٰهٌ واحِدٌ ۚ وَإِن لَم يَنتَهوا عَمّا يَقولونَ لَيَمَسَّنَّ الَّذينَ كَفَروا مِنهُم عَذابٌ أَليمٌ

Those who say, “God is third of three,” are in clear disbelief. There is no god except the One God. If they don’t desist from making such statements, a severe punishment will befall those among them who disbelieve.