Daniel 6:15
Then these men assembled together to the king, and said to the king, Know, O king, that it is a law of the Medes and Persians, that no decree nor statute which the king establishes may be changed.
Esther 8:8
Write also to the Jews, as it pleases you, in the king's name, and seal it with the king's ring; for the writing which is written in the king's name, and sealed with the king's ring, may not be reversed by any man."
Daniel 6:12
Then they came near, and spoke before the king concerning the king's decree: Haven't you signed an decree, that every man who shall make petition to any god or man within thirty days, except to you, O king, shall be cast into the den of lions? The king answered, The thing is true, according to the law of the Medes and Persians, which doesn't alter.
Psalm 94:20-21
Shall the throne of wickedness have fellowship with you, which brings about mischief by statute?
Daniel 6:8
Now, O king, establish the decree, and sign the writing, that it not be changed, according to the law of the Medes and Persians, which doesn't alter.