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 kafara alladhīna qālū inna l-laha thālithu thalāthatin wamā min ilāhin illā ilāhun wāḥidun wa-in lam yantahū ʿammā yaqūlūna layamassanna alladhīna kafarū min'hum ʿadhābun alīmun
Those people who say that God is the third of three are defying [the truth]: there is only One God. If they persist in what they are saying, a painful punishment will afflict those of them who persist.
Surely, disbelievers are those who said: "Allâh is the third of the three (in a Trinity)." But there is no Ilâh (god) (none who has the right to be worshipped) but One Ilâh (God -Allâh). And if they cease not from what they say, verily, a painful torment will befall on the disbelievers among them.