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