'Sealed It' in the Bible

He wrote [a decree] in the name of King Ahasuerus, and sealed it with the king’s ring, and sent letters by couriers on horseback, riding on the royal [mail] relay horses, the offspring of the racing mares.

I signed the deed and sealed it, and called in witnesses, and weighed out the money on the scales.

A stone was brought and laid over the mouth of the den; and the king sealed it with his own signet ring and with the signet rings of his nobles, so that nothing would be changed concerning Daniel.

and the angel hurled him into the abyss, and closed it and sealed it above him [preventing his escape or rescue], so that he would no longer deceive and seduce the nations, until the thousand years were at an end. After these things he must be liberated for a short time.