Daniel 6:16-17

So King Darius gave the order, and Daniel was brought in and thrown into the lions’ den. The king said to Daniel, “May the God you serve all the time save you!” A big stone was brought and placed over the opening of the lions’ den. Then the king used his signet ring and the rings of his royal officers to put special seals on the rock. This ensured that no one would move the rock and bring Daniel out.