Surah An-Nisa, verse 171

يَـٰٓأَهْلَ ٱلْكِتَـٰبِ لَا تَغْلُوا۟ فِى دِينِكُمْ وَلَا تَقُولُوا۟ عَلَى ٱللَّهِ إِلَّا ٱلْحَقَّ ۚ إِنَّمَا ٱلْمَسِيحُ عِيسَى ٱبْنُ مَرْيَمَ رَسُولُ ٱللَّهِ وَكَلِمَتُهُۥٓ أَلْقَىٰهَآ إِلَىٰ مَرْيَمَ وَرُوحٌ مِّنْهُ ۖ فَـَٔامِنُوا۟ بِٱللَّهِ وَرُسُلِهِۦ ۖ وَلَا تَقُولُوا۟ ثَلَـٰثَةٌ ۚ ٱنتَهُوا۟ خَيْرًا لَّكُمْ ۚ إِنَّمَا ٱللَّهُ إِلَـٰهٌ وَٰحِدٌ ۖ سُبْحَـٰنَهُۥٓ أَن يَكُونَ لَهُۥ وَلَدٌ ۘ لَّهُۥ مَا فِى ٱلسَّمَـٰوَٰتِ وَمَا فِى ٱلْأَرْضِ ۗ وَكَفَىٰ بِٱللَّهِ وَكِيلًا ﴿١٧١﴾

4:171 O People of the Book, do not go to extremes in your religion, and do not say about Allah but the truth. The Messiah, Jesus, son of Mary, was only a messenger of Allah, and His Word that He bestowed upon Mary, and a spirit from Him. So believe in Allah and His messengers and do not say “Three” [Trinity]. Cease; that is better for you. Indeed, Allah is the only One God. Glory be to Him, [far exalted is He] to have a son. To Him belongs all that is in the heavens and all that is on earth, and sufficient is Allah as a Disposer of Affairs