Daniel 6:15
These men, perceiving the king's mind, said unto him, "Know this, O king: that the law of the Medes and Persians is, that the commandment and statute which the king maketh, may not be altered."
Esther 8:8
Write ye now therefore for the Jews, as it liketh you in the king's name, and seal it with the king's ring." For the writings that were written in the king's name, and sealed with the king's ring, durst no man disannul.
Daniel 6:12
So they came to the king, and spake before him concerning his commandment, saying, "O king, hast thou not subscribed the statute, that within thirty days whoso requireth his petition of any god or man, but only of thyself, O king, he shall be cast into the den of the lions?" The king answered, and said, "It is true. It must be as a law of the Medes and Persians, that may not be broken."
Psalm 94:20-21
Wilt thou have anything to do with the stool of wickedness, which imagineth mischief as a law?
Daniel 6:8
Wherefore, O king, confirm thou this statute, and make a writing: that the thing which the Medes and Persians have ordained be not altered nor broken."