Translation of the meanings Ayah 4 Surah Al-Kahf - English Translation - Dr. Waleed Bleyhesh Omary - The Noble Qur'an Encyclopedia

Ayah: 4

وَيُنذِرَ ٱلَّذِينَ قَالُواْ ٱتَّخَذَ ٱللَّهُ وَلَدٗا

(4) and to warn^[3737] those who are of the saying: “Allah has taken ˹to Himself˺ a child!”^[3738]

[3737] Warning against threats is more likely to get people to act, thus it is repeated here (cf. al-Biqāʿī, Naẓm al-Durar). Besides, given the stiff opposition that the Call of Faith was up against during the context of revelation, al-Kahf carries more warning to the Deniers than glad tidings to the Believers.
[3738] Given the context of revelation, the ones meant here are the pagan Makkan Arabs who were widely known for saying that the angels were God’s daughters (as found in 17: 40; cf. Ibn ʿĀshūr). But this could also refer to the Jews, for their saying that Ezra is the son of God (cf. 9: 30), and warns them for their assisting the Makkans in asking the Noble Prophet about the news of the Companions of the Cave and the Two-Horned King in their quest to discredit him (cf. cf. al-Biqāʿī, Naẓm al-Durar).