2 In the NT, paradise is mentioned three times. In Luke 23:43 it refers to the abode of the righteous dead. In Rev 2:7 it refers to the restoration of Edenic paradise predicted in Isa 51:3 and Ezek 36:35. The reference here in 2 Cor 12:4 is probably to be translated as parallel to the mention of the “third heaven” in v. 2. Assuming that the “first heaven” would be atmospheric heaven (the sky) and “second heaven” the more distant stars and planets, “third heaven” would refer to the place where God dwells. This is much more likely than some variation on the seven heavens mentioned in the pseudepigraphic book 2 Enoch and in other nonbiblical and rabbinic works.
3 Or “things that cannot be put into words.”
4 Grk “a man.”

In other versions

and he heard things that cannot be told, which man may not utter.

was caught up to paradise and heard inexpressible things, things that no one is permitted to tell.

was caught up into paradise and heard inexpressible words, which a human being is not allowed to speak.

that I was caught up to paradise and heard things so astounding that they cannot be expressed in words, things no human is allowed to tell.

that he was caught up to paradise and heard words not to be spoken, which it is not permitted for a person to speak.

How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter.

Public Domain