And to warn those (Jews, Christians, and pagans) who say, "Allah has

﴿وَيُنذِرَ ٱلَّذِينَ قَالُواْ ٱتَّخَذَ ٱللَّهُ وَلَدٗا ﴾
[الكَهف: 4]

And to warn those (Jews, Christians, and pagans) who say, "Allah has begotten a son (or offspring or children)

﴿وينذر الذين قالوا اتخذ الله ولدا﴾ [الكَهف: 4]

Al Bilal Muhammad Et Al
Further, that He may warn those who say, “God has a son.”

Ali Bakhtiari Nejad
And warns those who say: God took a child

Ali Quli Qarai
and to warn those who say, ‘Allah has taken a son.’

Ali Unal
And to warn those who say: "God has taken to Him a child

Hamid S Aziz
And to give warning to those who say, "Allah has begotten a son

John Medows Rodwell
And that it may warn those who say, "God hath begotten a Son

Literal
And He/it warns/gives notice (to) those who said: "God took/received a child (a son)

Mir Anees Original
and (also) warn those who say, “Allah has taken a son.”

Mir Aneesuddin
and (also) warn those who say, “God has taken a son.”