Bible Verses About Medo-Persian Kingdom: Laws of, unalterable

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.

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.