Translation of the verse 4 from Surah Al-Kahf : Number of verses 110 - - page 293 - Part 15.
And to warn those (Jews, Christians, and pagans) who say, "Allah has begotten a son (or offspring or children)."
And to warn those who say, "Allah has taken a son."
(18:4) and that he should warn those people who say, "Allah has begotten a son". *2
*2) "Those people" includes the Christians, the Jews and the mushrik Arabs who assigned offspring to Allah.
Source : Al-Kahf Verse 4: And to warn those who say, "Allah has taken a son."