Quran 18:4 from Surah Al-Kahf on Divine Marvels.
وَيُنذِرَ ٱلَّذِينَ قَالُواْ ٱتَّخَذَ ٱللَّهُ وَلَدٗا
English translation: And to warn those who say Allah has taken Allah has taken a son
Transliteration: wayundhira alladhina qalu ittakhadha al-lahu waladan