'Sealed It' in the Bible

He wrote in the name of King Ahasuerus, and sealed it with the king's ring, and sent letters by courier on horseback, riding on royal horses that were bread from swift steeds.

I subscribed the deed, and sealed it, and called witnesses, and weighed him the money in the balances.

A stone was brought, and placed on the opening of the den; and the king sealed it with his own signet, and with the signet of his lords; that nothing might be changed concerning Daniel.

and cast him into the abyss, and shut it, and sealed it over him, that he should deceive the nations no more, until the thousand years were finished. After this, he must be freed for a short time.