Thematic Bible: Decrees of, irrevocable

You may write in the king’s name whatever pleases you concerning the Jews, and seal it with the royal signet ring. A document written in the king’s name and sealed with the royal signet ring cannot be revoked.” Verse ConceptsSealing The Message

So they approached the king and asked about his edict: "Didn't you sign an edict that for 30 days any man who petitions any god or man except you, the king, will be thrown into the lions' den?" The king answered, "As a law of the Medes and Persians, the order stands and is irrevocable." Then they replied to the king, "Daniel, one of the Judean exiles, has ignored you, the king, and the edict you signed, for he prays three times a day." As soon as the king heard this, he was very displeased; he set his mind on rescuing Daniel and made every effort until sundown to deliver him. read more.
Then these men went to the king and said to him, "You as king know it is a law of the Medes and Persians that no edict or ordinance the king establishes can be changed."

Therefore, Your Majesty, establish the edict and sign the document so that, as a law of the Medes and Persians, it is irrevocable and cannot be changed." So King Darius signed the document.