Daniel 6:12

So they approached the king and asked about his royal decree: “Did you not sign a decree that for thirty days any man who petitions any god or man except you, O king, will be thrown into the den of lions?” The king replied, “According to the law of the Medes and Persians the order stands, and it cannot be repealed.”

Then they came near, and spake before the king concerning the king’s decree; Hast thou not signed a decree, that every man that shall ask a petition of any God or man within thirty days, save of thee, O king, shall be cast into the den of lions? The king answered and said, The thing is true, according to the law of the Medes and Persians, which altereth not.