'Sealed It' in the Bible

And he wrote the name of king Ahasuerus, and sealed it with the king's ring, and sent letters by post on horseback, riding on swift steeds that were used in the king's service bred of the stud,

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

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 nothing might be changed concerning Daniel.