Al-Kahf • BN-TAFSEER-IBN-E-KASEER
﴿ وَيُنذِرَ ٱلَّذِينَ قَالُوا۟ ٱتَّخَذَ ٱللَّهُ وَلَدًۭا ﴾
“Furthermore, [this divine writ is meant] to warn all those who assert, "God has taken unto Himself a son."”
Please check ayah 18:5 for complete tafsir.