'Seal Up' in the Bible

And when the seven thunders spoke [words], I started to write down [what the voices said], but I heard a voice from heaven saying, "Seal up what the seven thunders have [just] said, and do not write them down."

Then the angel said to me, "Do not seal up the words of the prophecy of this book, for the time is near [i.e., for the events of its prophecies to begin to happen].