Daniel 6:7-9

7All the commissioners of the kingdom, the prefects and the satraps, the counselors and the governors have consulted and agreed together that the king should establish a royal statute and enforce an injunction that anyone who petitions (prays to) any god or man besides you, O king, during the next thirty days, shall be thrown into the den of lions.

8Now, O king, establish the injunction and sign the document so that it may not be changed, in accordance with the law of the Medes and Persians, which [insures that it] may not be altered or revoked.”

9So King Darius signed the document, that is, the injunction.