15 Then the men approached the king together and said to him, “Remember, O king, that by the law of the Medes and Persians no decree or ordinance established by the king can be changed.”
Daniel 6:15 Cross References - MSB
Esther 8:8
8 Now you may write in the king’s name as you please regarding the Jews, and seal it with the royal signet ring. For a decree that is written in the name of the king and sealed with the royal signet ring cannot be revoked.”
Psalms 94:20-21
Daniel 6:8
8 Therefore, O king, establish the decree and sign the document so that it cannot be changed—in accordance with the law of the Medes and Persians, which cannot be repealed.”
Daniel 6:12
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 The king replied, “According to the law of the Medes and Persians the order stands, and it cannot be repealed.”