Cross reference
Daniel 6:15
15 Then these men assembled together unto the king, and said unto the king, Know, O king, that it is a law of the Medes and Persians, that no interdict nor statute which the king establisheth may be changed.
Esther 8:8
8 Write ye also to the Jews, as it pleaseth 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 no man reverse.
Daniel 6:12
12 Then they came near, and spake before the king concerning the king's interdict: Hast thou not signed an interdict, that every man that shall make petition unto any god or man within thirty days, save unto 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 altereth not.
Psalms 94:20-21
20 Shall the throne of wickedness have fellowship with thee, Which frameth mischief by statute?
21 They gather themselves together against the soul of the righteous, And condemn the innocent blood.
Daniel 6:8
8 Now, O king, establish the interdict, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which altereth not.