Translation:

5. No knowledge have they of such a thing nor had their fathers. It is a grievous thing that issues from their mouths as a saying. What they say is nothing but falsehood!

Notes (Tafseer)

2330. The attribution of a son "begotten" to Allah has no basis in fact or in reason. It is only a "word" or "saying" that issues out of their mouths. It is not even a dogma that is reasoned out or can be explained in any way that is consistent with the sublime attributes of Allah.