Daniel 6:8

“If it seems good to the king, let a royal word go forth from him, and let it be written in the laws of Persia and Media so that it cannot be repealed, that Vashti may no longer come into the presence of King Ahasuerus, and let the king give her royal position to another who is better than she.

“‘PERES’—your kingdom has been divided and given over to the Medes and Persians.”

Then they came near and said before the king concerning the king’s injunction, “Did you not sign an injunction that any man who seeks to make a petition to any god or man besides you, O king, for thirty days, is to be cast into the lions’ den?” The king answered and said, “The word is certain, according to the law of the Medes and Persians, which may not be revoked.”

Then these men came by agreement to the king and said to the king, “Know, O king, that it is a law of the Medes and Persians that no injunction or statute which the king establishes may be changed.”