Daniel Chapter 6 Vs. 17

 The Prosecution of Daniel

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. Dan. 6:17

stone was brought... All this precaution served to prove to Darius and his lords that it was the power of God which delivered Daniel. There could be no trick played that would deliver Daniel from such a place. The same precaution was used in the case of Christ in the tomb, but this only served to prove the certainty of the resurrection (Mat. 27:63-66; Mat. 28:12-15).

So that Daniel could not escape from the lions’ den, a stone was placed over the mouth of the den, which was then sealed with a royal seal. Besides the side opening to the den (perhaps an underground cave) there may have been an opening at the top (cf. Dan. 6:23-24). The seal, an impression made in clay by an image on a ring, would inform others that the stone was not to be tampered with in an effort to free Daniel. Reluctantly the king confined Daniel to the den.

The king’s signet was pressed into wax to show his seal. This signet was usually on a ring. We can see a type of the Lord Jesus, when they put the stone on the tomb, here. Daniel is in the den of lions. There is seemingly no way out.