'Seal Up' in the Bible

They were told not to harm the grass of the earth or any plant or tree, but only the men who did not have the mark of God's seal upon their foreheads.

When the seven thunders had spoken I was going to write it down, but I heard a voice from heaven say, "Seal up what the seven thunders have said! Do not write it down!"

"Do not seal up the words of prophecy that are in this book," he said to me, "for the time of their fulfilment is very near.