'Sealed' in the Bible

And a stone was brought, and laid upon the mouth of the den; and the king sealed it with his own signet, and with the signet of his lords; that the purpose might not be changed concerning Daniel.

My God sent his angel and sealed the mouths of the lions. They have not harmed me, proving that I'm innocent before him. Also against you, your majesty, I've committed no offense."

And he said, Go thy way, Daniel: for the words are closed up and sealed till the time of the end.