A stone was brought and placed over the mouth of the den, and the king sealed it with his own signet ring and with the rings of his nobles, so that nothing concerning Daniel could be changed.
Jewish Publication Society of America Version (JPS1917) - Daniel 6:17 >(6-18) 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.