Daniel 6:15
Then these men came in a body unto the king, and said unto the king, Know, O king, that the law of the Medes and Persians is, That no decree nor statute which the king establisheth may be changed.
Esther 8:8
Write ye then for the Jews as seems good to you, in the king's name, and seal it with the king's ring. For a writing that is written in the king's name, and sealed with the king's ring, cannot be reversed.
Daniel 6:12
Then they came near, and spoke before the king concerning the king's decree: Hast thou not signed a decree, that every man that shall ask anything of any god or man within thirty days, except of thee, O king, shall be cast into the den of lions? The king answered and said, The thing is true, according to the law of the Medes and Persians, which may not be revoked.
Psalm 94:20-21
Shall the throne of wickedness be united to thee, which frameth mischief into a law?
Daniel 6:8
Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which may not be revoked.