'Sealed It' in the Bible

And he wrote in the king Ahasuerus's name, and sealed it with the king's ring, and sent letters by posts on horseback, and riders on mules, camels, and young dromedaries:

And I subscribed the contract, and sealed it, and took 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 the purpose might not be changed concerning Daniel.