Sura al-Nisāʾ 4:171

يَٰٓأَهْلَ ٱلْكِتَٰبِ لَا تَغْلُوا۟ فِى دِينِكُمْ وَلَا تَقُولُوا۟ عَلَى ٱللَّـهِ إِلَّا ٱلْحَقَّ إِنَّمَا ٱلْمَسِيحُ عِيسَى ٱبْنُ مَرْيَمَ رَسُولُ ٱللَّـهِ وَكَلِمَتُهُۥٓ أَلْقَىٰهَآ إِلَىٰ مَرْيَمَ وَرُوحٌ مِّنْهُ فَـَٔامِنُوا۟ بِٱللَّـهِ وَرُسُلِهِۦ وَلَا تَقُولُوا۟ ثَلَٰثَةٌ ٱنتَهُوا۟ خَيْرًا لَّكُمْ إِنَّمَا ٱللَّـهُ إِلَٰهٌ وَٰحِدٌ سُبْحَٰنَهُۥٓ أَن يَكُونَ لَهُۥ وَلَدٌ لَّهُۥ مَا فِى ٱلسَّمَٰوَٰتِ وَمَا فِى ٱلْأَرْضِ وَكَفَىٰ بِٱللَّـهِ وَكِيلًا

yāʾahla l-kitābi lā taghlū fī dīnikum wa-lā taqūlū ʿalā allāhi illā l-ḥaqqa innamā l-masīḥu ʿīsā ibnu maryama rasūlu allāhi wa-kalimatuhu alqahā ilā maryama wa-rūḥun minhu fa-āminū billāhi wa-rusulihi wa-lā taqūlū thalāthatun antahū khayran la-kum innamā allāhu ilāhun wāḥidun subḥānahu an yakūna lahu waladun lahu mā fī l-samāwāti wa-mā fī l-arḍi wa-kafā billāhi wakīlan

O People of the Book! Commit no excesses in your religion: Nor say of Allah aught but the truth. Christ Jesus the son of Mary was (no more than) a messenger of Allah, and His Word, which He bestowed on Mary, and a spirit proceeding from Him: so believe in Allah and His messengers. Say not "Trinity" : desist: it will be better for you: for Allah is one Allah: Glory be to Him: (far exalted is He) above having a son. To Him belong all things in the heavens and on earth. And enough is Allah as a Disposer of affairs.