NET

4 was caught up into paradise and heard things too sacred to be put into words, things that a person is not permitted to speak.

Darby

4 that he was caught up into paradise, and heard unspeakable things said^D8505 which it is not allowed to man to utter.

Darby Bible Notes

said - Rhema, 'the saying' and thence 'the things said.' It was not merely like heathen mysteries, dreadful forms of speech, but the communications were of things not suited to this lower world and our mortal condition.

KJV

4 How that he was caught up into paradise, and heard unspeakable words, which it is not lawful^K6988for a man to utter.

KJV Bible Notes

lawful: Or, possible.