Daniel 6:12 NASB

[12] Then they approached and spoke before the king about the king’s injunction: “Did you not sign an injunction that any person who offers a prayer to any god or person besides you, O king, for thirty days, is to be thrown into the lions’ den?” The king replied, “The statement is true, according to the law of the Medes and Persians, which may not be revoked.”