The royal administrators, prefects, satraps, advisers and governors1 have all agreed that the king should issue an edict and enforce the decree that anyone who prays to any god or man during the next thirty days, except to you, O king, shall be thrown into the lions' den.2
References for Daniel 6:7
Now, O king, issue the decree and put it in writing so that it cannot be altered--in accordance with the laws of the Medes and Persians, which cannot be repealed."3
References for Daniel 6:8
So King Darius put the decree in writing.