لَّقَدْ كَفَرَ ٱلَّذِينَ قَالُوٓا۟ إِنَّ ٱللَّهَ ثَالِثُ ثَلَـٰثَةٍ ۘ وَمَا مِنْ إِلَـٰهٍ إِلَّآ إِلَـٰهٌ وَٰحِدٌ ۚ وَإِن لَّمْ يَنتَهُوا۟ عَمَّا يَقُولُونَ لَيَمَسَّنَّ ٱلَّذِينَ كَفَرُوا۟ مِنْهُمْ عَذَابٌ أَلِيمٌ
laqad kafaral lazeena qaalooo innal laaha saalisu salaasah; wa maa min ilaahin illaaa Ilaahunw Waahid; wa illam yantahoo 'ammaa yaqooloona layamas sannal lazeena kafaroo minhum 'azaabun aleem
Those who say, "God is the third of three," have denied the truth. There is no god but one God. If they do not stop saying this, a painful punishment will surely strike those among them who persist in denial.